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How to Make Feminized Seeds at Home

First of all, what are “feminized” marijuana seeds? Although male and female plants look the same when young, only female cannabis plants make buds. Male cannabis plants grow non-potent pollen sacs instead. Male plants also lower yields and cause seedy buds if they’re left among your female plants for too long. Because male plants don’t make buds and their presence reduces the quality of buds, most growers toss male plants the moment they see pollen sacs forming. However, since about half of regular cannabis seeds end up being male, that means you end up tossing half your plants once they start flowering.

Feminized seeds come from two female plants being bred together, causing all offspring to be female (which means every plant makes buds)

While regular seeds make female plants about half the time, feminized seeds only create female plants. That means you won’t need to toss half the plants once they start flowering. But how are feminized seeds made and can you make them at home?

Feminized seeds are created by breeding two female plants together. Because there are no male parents, all the resulting seeds end up being bud-bearing female plants. With feminized seeds, you can count on every plant to produce buds. Learn more about male vs female plants and feminized cannabis seeds.

Feminized seeds are available from seed banks for nearly every popular or famous strain. Breeders understand that a lot of people just want to grow plants for buds, and don’t care about making a robust breeding program (which is one of the main reasons growers want male plants).

You can’t see the difference between male and female plants until they start flowering (unless you do a genetic test). Feminized seeds ensure all plants are female so you don’t need to worry about it. You know that every plant is female from germination.

So how do seed banks feminize their seeds? How do you breed two female plants together?

The main idea is to force a female plant to produce pollen sacs like a male plant. These flowers (growing on a female plant) create pollen, which can be harvested and used to pollinate another female cannabis plant. The resulting seeds will all end up being female. Can feminizing seeds cause hermaphrodite plants?

Growers can force a female plant to make pollen sacs, and the “feminized” pollen produced can be used to fertilize another female plant. The resulting seeds will only produce female plants.

How do you force a female plant to make pollen?

There are two main ways to make feminized pollen:

  1. Induce feminized pollen chemically (Recommended) – This is the professional way to feminize seeds and is how reputable seed banks and breeders create feminized seeds to sell to the public. Substances that interact with plant processes such as colloidal silver or gibberellic acid are applied to bud sites of a female plant when they start flowering. Bud sites are drenched daily for the first 3-4 weeks after the switch to 12/12. This causes a female plant to produce pollen sacs which release feminized pollen when they open up. This pollen is used on another female plant to produce feminized seeds. This article will give you step-by-step instructions on how to feminize cannabis seeds using this method.
  2. Rhodelization (Not Recommended!) – In some cases, a female cannabis plant may naturally start making male pollen sacs or bananas, which can self-pollinate the plant. This happens if the plant is stressed, or if the plant is not harvested in time and buds start to die of old age. The plant is basically doing everything it can to make seeds and save the next generation. This method is “natural” and these seeds end up being mostly female. The problem with this method is you’re selecting for plants that naturally turn into hermies (grow both male and female sex organs) without any chemical induction. This means the resulting seeds are much more likely to turn hermie in natural conditions, too. That’s a problem if you don’t want seedy buds every time you harvest. For that reason, it’s highly recommended you don’t feminize seeds this way. It’s also a good idea to toss any and all seeds that are the result of natural herming (for example seeds you find in your buds even though you didn’t grow any male plants).

Read this article for more in-depth discussion about the pros and cons of each method, and how to avoid hermaphrodite plants when producing your own feminized seeds.

Overview: How to Make Feminized Seeds

This is a quick overview of the process, and then I’ll give the full details and steps below.

1.) Buy or Make Colloidal Silver – The article below will teach you how to make colloidal silver at home, as well as show you where to buy it if you don’t want to make it (it’s actually pretty cheap). It’s basically a solution of silver suspended in water and is available online and in health stores as a dietary supplement.

What about gibberellic acid? From what I understand it can be used exactly the same way as colloidal silver to induce female plants to produce pollen, but I don’t know the recipe for an effective gibberellic acid solution. On the other hand, I know that this exact colloidal silver method works for making feminized seeds. That’s why I’ve only included instructions for colloidal silver. If you’ve used gibberellic acid to make feminized seeds; we’d love to hear from you.

2.) Spray the bud sites of your known female plant daily during the first 3-4 weeks of the flowering stage (until pollen sacs form and start splitting open) – After switching to a 12/12 light schedule to initiate the flowering stage, choose bud sites on your known female plant, and spray/drench them daily with colloidal silver (or gibberellic acid). As the treated flowers develop, they will form into male pollen sacs instead of regular buds. Untreated bud sites on the plant will form into female buds as usual; however, these buds are unsafe to smoke unless you’ve been very careful to make sure they didn’t come into contact with colloidal silver or gibberellic acid during the feminization process as these are unsafe for smoking.

3.) Harvest “Feminized” Pollen – When pollen sacs are ready to be harvested they swell like a balloon and start to open up. Don’t harvest early! Keep spraying the bud sites daily until pollen sacs open or you might end up with empty pollen sacs. When the pollen sacs are ready, the leaf section protecting the pollen will start to crack. At this point, it’s time to collect the feminized pollen. One of the easiest ways to do this is to collect the pollen sacs directly and let them dry for a week. At that point, they can be placed in a bag and shaken to collect all the pollen.

4.) Pollinate Another Female Plant – At this point, take the feminized pollen you’ve collected and use it to pollinate a female plant that has been flowering for about 2-3 weeks (full detailed instructions with a video on how to do this below). Although it’s possible to pollinate the same plant as the original, it’s not recommended in part because the timing doesn’t match up (pollinating buds late in the flowering stage doesn’t produce many seeds). It’s best to pollinate a different female plant that you started budding a few weeks after the original. This increases the number of seeds produced as well as gives the new female plant enough time to develop them to maturity. It also increases genetic diversity compared to self-pollination.

5.) Wait ~6 Weeks After Pollination to Harvest Seeds – After about 6 weeks from pollination, the calyxes on the buds of your female plant will be swollen and fat. You know it’s time to harvest your seeds when they start bursting out. At this point, it’s time to congratulate yourself because you’ve got feminized seeds!

Now that you’ve gotten the overview, here’s the feminization process with detailed step-by-step instructions…

Step-By-Step Instructions (with pics!)

1.) Buy or Make Colloidal Silver (or Gibberellic Acid)

Where to get Colloidal Silver (your options):

    Buy Ready-To-Use Colloidal Silver: Colloidal silver is sometimes used as a dietary supplement, so it’s relatively easy to find (never take it without talking to a doctor first though!). If you’re purchasing colloidal silver, try to find a solution that has at least 30 PPM (parts per million) of silver or higher.
  1. Buy A Colloidal Silver Generator Kit: If you plan on feminizing a lot of seeds, you may want to invest in a generator kit so you can easily make your own endless supply of colloidal silver. This is cheaper in the long run compared to buying it ready-to-use.
  2. Make Your Own: You can make your own colloidal silver generator at home. The following diagram illustrates what you need to do.

Note: You can purchase gibberellic acid online (a gibberellic acid solution can be used the same way as colloidal silver for feminizing seeds). However, I do not have experience with the gibberellic acid method and don’t know the best way to prepare the solution.

2.) Spray the bud sites of your known female plant daily during the first 3-4 weeks of the flowering stage (until pollen sacs form and start splitting open)

Wait until your plant is 5-6 weeks old before initiating the flowering stage. Some young plants seem to have trouble (and take much longer) to go through the feminization process, and their pollen may not be as fertile, so start with a more mature plant.

When plants are ready, change to a 12/12 light schedule to initiate flower formation and put cannabis plants in the flowering stage. Note: If you’re feminizing an auto-flowering plant, start spraying daily when the plant is about 20 days old from seed. This is when most auto-flowering cannabis strains start making flowers.

As soon as you change the light schedule (and maybe even a day or two before) start spraying your plants thoroughly with colloidal silver at every bud site you want to form into pollen sacs.

Spray bud sites thoroughly, drenching them with colloidal silver every single day. Bud sites are located wherever leaves meet stems.

The above pic shows you where pollen sacs form on the plant (the same places female buds form).

Important! Keep spraying daily until pollen sacs open up. Don’t stop spraying early, even if pollen sacs appear to be already formed, otherwise they may not produce much pollen

A spray bottle / mister is really helpful for spraying bud sites evenly and thoroughly

You can choose to treat a single bud site or all the bud sites on the plant. Any untreated bud sites will develop into female buds as usual. If you want to smoke these buds, it’s incredibly important to avoid letting them come into contact with colloidal silver because silver is not safe to smoke. (Don’t worry, feminized seeds don’t contain any silver). I highly recommend letting the whole plant be your test subject so you don’t have to worry about that

3.) Harvest Your Feminized Pollen

When pollen sacs are starting to crack and look like they’re about to open up (or if you can see one has already opened) then your pollen is ready for harvest!

When pollen sacs are cracking and opening up, you’re ready to harvest your pollen!

Pollen spilling onto a nearby leaf

One way to harvest your pollen is to gently and carefully remove all the pollen sacs. Let them dry in open air for a week, and then put them in a resealable bag. If you shake the bag the pollen should easily spill out. You may need to cut a few open yourself.

How to Store Feminized Pollen: Moisture is your main enemy when storing pollen. It can help to double the mass of the pollen collected by adding regular cooking flour. This absorbs moisture during storage and as an added bonus, it increases the volume to make application easier when you get to pollinating. If pollen is totally dry and you triple-bag the pollen-flour mixture and stick it in the freezer (with a good nametag so you know where the pollen came from), your pollen can be stored for a year or longer. You can add a few silica packs (which suck out any remaining moisture) in the bag to make extra sure that the pollen stays totally dry.

4.) Pollinate Another Female Plant

When your chosen mother is 2-3 weeks into the flowering stage, take a small paintbrush or powder brush and ‘paint’ your feminized pollen on the developing bud sites you want to pollinate. Bud sites (for both male and female plants) are located wherever you can see leaves meet a stem.

Buds are ready to get pollinated when they look like little bunches of white hairs

Only the buds that come in contact with pollen will grow seeds. You can choose to pollinate all of your buds or just a few on the plant.

Here’s a video by Ed Rosenthal on Youtube showing you how to pollinate buds with pollen. Make sure to touch all the female pistils/hairs with your pollen.

5.) Wait About 6 Weeks Then Harvest Seeds

It usually takes about 6 weeks for your feminized seeds to fully develop. Some plants are literally dying right as the seeds become ready, so to get the most viable seeds, you need to try to keep it alive until the seeds actually start dropping. The seeds can be used right away, or stored in a cool, dry place for a few years. Don’t forget to label them with the date.

This seed is about to burst out of its calyx

This is what it looks like when the seed is exposed

Picture Journal of Making Feminized Pollen with Colloidal Silver

This grower initiated the feminization process on a seedling that was only a few weeks old. As a result, the plant wasn’t able to get big enough to produce many pollen sacs. You will get even better results if you start with a plant that is at least 5 weeks old

October 18 – Plant right before the switch to 12/12

October 27 – After being drenched with colloidal silver daily for a little over a week

October 30 – Pollen sacs are forming

November 15 – Pollen sacs appear to be almost fully formed and are swelling in size, but haven’t opened up yet. Don’t stop spraying colloidal silver or you may end up with empty sacs!

November 27 – Pollen sacs are opening up! Collect the pollen before they’re all open!

FAQs – Frequently Asked Questions

How can I identify plant gender before the plant actually starts flowering?

There are a few ways to identify plant gender before the plant actually starts flowering, and each is helpful in different situations.

  1. Use feminized seeds – All your plants will be female if you start with pre-made feminized seeds.
  2. Start with a clone – A clone is an exact copy of another plant. If the “mother” of the clone is a female plant, it means the clone is also female
  3. Look at preflowers (identify plants when they’re 3-6 weeks from seed) – If you know where to look, cannabis plants will actually reveal their gender in the vegetative stage when they’re just 3-6 weeks from seeds. Male plants usually show their gender by 3-6 weeks and female plants usually show their gender around week 4-8 from seed. Learn how to determine the sex in the veg stage by looking at preflowers.
  4. Test the leaves of your seedling in a lab – It’s possible to send in a leaf from a young cannabis plant to a specialized testing company, and they will be able to determine the gender as soon as 3 weeks from seed! Although I haven’t used any of these companies and can’t recommend any in particular, here’s a link to one example just so you can see what I’m talking about. From talking to other growers who use this method, it appears to be accurate.
  5. Take a clone and force it to start flowering – if you take a clone from a vegetative plant, you can force that clone to start flowering and reveal its gender. You’ll know the sex of the “parent” plant by the sex expressed by the clone. This is what I do to determine the sex. I cut off a piece of the plant, stick it in a glass of water (don’t forget to label it with the strain), and give it a 12/12 light schedule until the little piece starts forming either pollen sacs or buds.

The easiest way to identify sex with unknown seedlings? Cut off a small branch of the plant, stick it in a cup of water with a label, and keep it in a sunny window on a 12/12 light schedule until buds or pollen sacs start forming. As long as the plant is getting bright light in the day and long dark nights, it will reveal its sex in just a few weeks (you don’t even need to wait for roots to form).

Can I Make a Breeding Program Using Just Female Plants and Feminized Seeds?

Yes, it’s possible to use just female plants and feminized seeds for further breeding, with one major caveat.

Without careful and thorough testing, it may be possible to accidentally select cannabis plants that tend to herm (make male flowers or pollen) and cause seedy buds when you don’t want them to.

For each possible “mother,” clones should be grown in several different environments and tested thoroughly to make sure that the mother plant does not have any tendency to make pollen naturally in normal or stressful conditions. It’s okay if plants grow pollen sacs if induced chemically since that is very unlikely to happen in someone’s garden on accident, but you don’t want plants that will start growing male flowers on their own without chemical induction. Thorough testing of plant hardiness is always important when breeding, but it may be especially important when breeding feminized seeds together.

Are there other reasons I should avoid breeding seeds without males?

The most common reason growers say you shouldn’t do this is because it’s “unnatural” or doesn’t “seem right.” Some growers say you need male plants for genetic diversity. I’ve also heard growers say that the resulting plants will be weaker, sterile, and less potent. Someone once even told me that resulting plants “will be worse in every way.”

As of yet, I haven’t seen any of these claims backed by actual personal experience, or any real-life examples showing why using feminized seeds is not a viable way to breed new strains.

To those who say this type of reproduction just doesn’t seem right, the evolutionary strategy of plants using only female and hermaphrodite plants to breed is actually pretty common and is known as gynodioecy. One example of a plant that only reproduces this way is a flower found in Canada and the US called Lobelia siphilitica, also known as the Great Lobelia. Obviously, this reproduction method isn’t exactly the same as artificial feminization since the pollen production is caused naturally instead of induced chemically, but examples of gynodioecy show that a female flower-based breeding population can exist in the wild even when no plants are purely male.

The Great Lobelia naturally reproduces using only female and hermaphrodite plants. This is similar to the cannabis feminization process because it results in a population of plants that all primarily grow female flowers, with no pure male plants

When it comes to genetic diversity, the ability to cross out to thousands of different cannabis strains allows you to dramatically increase the gene pool without using male plants. So those are my answers to the common objections of a feminized seed-based breeding program, however I am just a theory-crafter when it comes to this topic. It certainly seems possible that a feminized-only breeding program could run into unforeseen problems down the road, but as far as I know there isn’t any evidence of that so far.

Although I have a few anecdotes from growers who have used only feminized seeds for a few generations, it would be much better to share information from someone who has conducted plenty of testing over several generations. We’d love to hear from you if you have bred more than a few generations using only feminized seeds and want to share your experience.

What are the positive aspects of breeding two feminized seeds together?

Besides not having to worry about male plants in the next generation, the main advantage of doing this is you have a much better idea of what you’re working with when it comes to producing the type of buds you’re looking for. When you’re growing a male plant, it has several genes it will pass to its offspring that has to do with how buds develop, but since it’s a male plant those genes aren’t expressed and it’s hard to figure out what they are.

Historically, the way to learn more about the “hidden genes” contained in a male plant is to breed it to several well-known female plants and see how the offspring compare to each other. The genes that don’t come from the known mother plant are assumed to come from the male. Another way of going about this is to take several clones of the same well-known female plant and breed them with many different male plants to see which ones produce the best offspring.

After testing with several pairings, you start to get an idea of the hidden genes a male plant has to offer to its female offspring. This time-consuming process of documenting and identifying good male plants is why proven stud male plants are one of the most valuable and closely guarded types of clones available today.

But the process of finding the right “father” is a little different when you start with two female plants. In this case, you already know quite a bit about the genes of both parents because you can just look at and test the buds of both plants directly. This allows you to pinpoint desirable genes with less guessing and much less time spent growing out and cataloging plants.

Breeding two female plants together offer hints about what kind of buds their genes will produce

Why even have male plants then?

In nature, male plants are effective at increasing genetic diversity by ensuring cross-pollination. With only purely male and purely female plants, every resulting seed will have two different parents.

Another big advantage in the wild of having separate female and male plants is sexual specialization. In other words, plants are able to evolve male and female traits separately, so each type of flower can become more specialized at its unique “job.”

However, this isn’t the only successful breeding strategy for plants. In fact, only 6-7% of plants have completely separate male and female plants like cannabis plants do (known as dioecious plants). Most plants grow some mix of male and female flowers on each plant, with different combinations offering different evolutionary benefits.

You might enjoy this scientific article if you want to learn more about the evolution of sex determination in plants and animals: Sex Determination: Why So Many Ways of Doing It?

And although most cannabis strains (at least the good ones) display either purely male or purely female flowers, there are some wild populations (and some strains of hemp) that regularly produce plants with male and female parts on the same plant.

When it comes to artificial selection for breeding new strains, the grower is in charge of cross-pollination, so there’s no need for the plant to specialize in male parts. Pretty much the only thing most growers care about is how female flowers develop. So (unlike in nature) growers have the freedom to choose plants that improve female buds without even having to consider how it might affect male plants.

Only a small percentage of plant species produce male plants like cannabis.

Can feminizing seeds result in hermaphrodite plants?

The answer is yes. If you do it the wrong way then feminization can lead to plants with an increased chance of herming. However, with a well-tested and well-bred feminization program, one of the main goals is to breed out any plants with hermaphroditic tendencies that show up under normal conditions. When you buy feminized seeds from trustworthy breeders, you can count on the fact that every plant will end up growing only female flowers and that’s it.

This is a relatively big topic with a lot of opposing opinions so I wrote a whole article about it.

Feminizing seeds the wrong way can result in hermaphrodite plants.

Can I pollinate the same plant I collected the pollen from?

Yes, it’s possible. However, it’s not really recommended because, for one, the timing doesn’t match up. By the time your pollen is ready to use, your original plant will already be several weeks past the optimum pollination point. It’s best to pollinate a female plant that has only been flowering about 2-3 weeks, but pollen sacs need more time before pollen is ready to use. It’s also possible to run into unwanted side effects from self-pollination/in-breeding.

One thing to keep in mind is even if you pollinate a plant to itself, the resulting seeds are likely not going to be exact copies of the original (unless the original plant is extremely inbred). The resulting seeds include not just the mother’s expressed genes but also her hidden ones.

Cannabis seeds 101: How to grow marijuana from seed

Cannabis is grown from one of two sources: a seed or a clone. Seeds carry genetic information from two parent plants and can express many different combinations of traits: some from the mother, some from the father, and some traits from both.

In commercial cannabis production, generally, growers will plant many seeds of one strain and choose the best plant. They will then take clones from that individual plant, which allows for consistent genetics for mass production.

If cannabis is legal in your state, you can buy seeds or clones from a local dispensary, or online through various seed banks.

Cannabis seeds vs. clones

For the typical homegrower, it may be easier to obtain cannabis seeds rather than clones. Growing from seed can produce a stronger plant with more solid genetics.

Plants grown from seed can be more hearty as young plants when compared to clones, mainly because seeds have a strong taproot. You can plant seeds directly into an outdoor garden in early spring, even in cool, wet climates.

If growing outside, some growers prefer to germinate seeds inside because they are delicate in the beginning stages of growth. Indoors, you can give weed seedlings supplemental light to help them along, and then transplant them outside when big enough.

Most seeds that you will buy are regular seeds as described above, but here are a couple more types.

How weed seeds work

Cannabis can be either male or female—also called “dioecious”—but only females produce the buds we all know and love. For reproduction, males have pollen sacs and pollinate females, causing female flowers to produce seeds.

Once cannabis seeds are mature, the female plant begins to die, and seeds are either dropped to the ground where they grow into new cannabis plants next spring, or the seeds are harvested for processing into seed oil or food products, or stored so they can be sown in the ground later and become the next generation of plants.

To get the buds found in medical and recreational stores, female cannabis plants are grown in an environment without males—or the males are removed from the area before they release pollen—so the females don’t create seeds. Females can then focus their energies on producing buds and not seeds—this high-potency marijuana is traditionally known as “sinsemilla,” meaning “seedless.”

Some varieties of cannabis can produce male parts alongside female flowers on the same plant, especially if exposed to environmental stressors. These plants are known as hermaphrodites, and sometimes they can self-pollinate to create seeds.

Pros and cons of using cannabis seeds

Check out Johanna’s full video series on how to grow weed on Leafly’s YouTube .

If buying from a reputable breeder or seed bank, growing from seed is the best way to ensure your plants will have solid genetics and start clean, meaning they won’t come with diseases or pests.

Also, buying from a reputable breeder or seed bank will give you a sense of what a particular strain will look and smell like, how it will grow, and how much it will yield at harvest.

The main drawback to growing from seed is there is no guarantee as to what you’ll end up with—if you buy a regular pack of cannabis seeds, it will be a mix of males and females. You’ll need to sex them out (more below) to identify the males and get rid of them, because you don’t want your females producing seeds.

Sexing marijuana plants can be a time-consuming process, and if you don’t catch males, there is a risk that even one males can pollinate your entire crop, causing all of your female weed plants to produce seeds.

One way to avoid sexing plants is to buy feminized seeds (more below), which ensures every seed you plant will be a bud-producing female.

You can also minimize headaches and avoid the hassle of seed germination and sexing plants by starting with clones.

How weed clones work

Aside from producing cannabis through seeds, or sexual reproduction, you can also reproduce the plant through cloning, or asexual reproduction. A clone is a cutting that is genetically identical to the plant it was taken from—that plant is known as the “mother.”

Pros and cons of using cannabis clones

Through cloning, you can create a new harvest with exact replicas of your favorite plant. Because genetics are identical, a clone will give you a plant with the same characteristics as the mother, such as flavor, cannabinoid profile, yield, grow time, etc. So if you come across a specific strain or phenotype you really like, you might want to clone it to reproduce more buds that have the same effects and characteristics.

With cloning, you don’t have to get new seeds every time you want to grow another plant—you just take a cutting of the old plant—and you don’t have to germinate seeds or sex them out and get rid of the males.

One drawback of clones is they need to be taken during the vegetative stage of a plant—flower is too late—so if you have a small setup with only one light, it can be hard to keep clones alive while flowering other plants, because the two need different amounts of light.

Another drawback to clones is they can take on negative traits from the mother plant as well. If the mother has a disease, attracts pests, or grows weak branches, its clones will probably have the same issues.

Additionally, every long-time grower will tell you that clones degrade over time.

What are feminized cannabis seeds?

Feminized cannabis seeds will produce only female plants for getting buds, so there is no need to remove males or worry about female plants getting pollinated. Feminized seeds are produced by causing the monoecious condition in a female cannabis plant—the resulting seeds are nearly identical to the self-pollinated female parent, as only one set of genes is present.

This is sometimes referred to as “cloning by seed” and will not produce any male plants. This is achieved through several methods:

  • By spraying the plant with a solution of colloidal silver, a liquid containing tiny particles of silver
  • Through a method known as rodelization, in which a female plant pushed past maturity can pollinate another female
  • Spraying seeds with gibberellic acid, a hormone that triggers germination (this is much less common)

Most experienced or commercial growers will not use feminized seeds because they only contain one set of genes, and these should never be used for breeding purposes. However, a lot of beginning growers start with feminized seeds because they eliminate the worry of having to deal with male plants.

Top feminized cannabis strain families

A lot of classic weed strains that have been around for a while come in feminized form. Some popular fem seeds are:

  • OG Kush
  • Haze
  • Afghan
  • GSC (Cookies)
  • Skunk
  • Cheese
  • Gelato

What are autoflowering cannabis seeds?

Autoflowering seeds are also popular with beginning growers. They are easy to grow because you don’t have to worry about light cycles and how much light a plant receives.

Most cannabis plants begin flowering when the amount of light they receive on a daily basis reduces. Outdoors, this happens when the sun starts setting earlier in the day as the season turns from summer to autumn. Indoor growers can control when a plant flowers by reducing the daily amount of light plants receive from 18 hours to 12 hours.

However, a type of cannabis called Cannabis ruderalis, which developed in extreme northern conditions without much sunlight, will begin flowering once the plant reaches a certain age—they automatically start flowering regardless of the amount of light they receive, hence the name “autoflower.”

Pros and cons of growing autoflower

Because they grow and flower quicker, growers can fit in multiple autoflower cannabis harvests into the span of one regular harvest.

Autoflowers can be started in early spring and will flower during the longest days of summer, taking advantage of high quality light to get bigger yields. Or, if you get a late start in the growing season, you can start autoflowers in May or June and harvest in the fall.

Also, autoflower plants are small—perfect for closet grows or any small grow, or growing outdoors where you don’t want your neighbors to see what you’re up to.

A couple big drawbacks, though: Autoflower strains are known for being less potent. Also, because they are small in stature, they usually don’t produce big yields.

However, potency in autoflowering varieties has increased significantly since their initial introduction, with some breeders crossbreeding the low-THC ruderalis with other more potent varieties.

Tips for growing autoflower marijuana seeds

Autoflowering strains require some preparation, as they will grow quickly and start to flower whether or not you’re ready for them.

Climate considerations

Many marijuana growers start autoflowers early in the season, and at a different time than a regular crop, so keep the season and climate in mind when growing and harvesting—your plants still need warmth to grow, and rain can give them bud rot. Consider growing in a greenhouse to protect them.

Training plants

Because training happens during vegetative growth, for autoflowering plants, this period could be as short as a few weeks, which means time is limited. Try topping your autoflowers after they have three nodes, and stop once they begin to flower. You will want to prune them lightly.

Go easy on nutrients

Autoflowers don’t need lots of nutrients because they’re small and don’t spend much time in the vegetative cycle. They won’t need as much veg nutrients—such as nitrogen—but will need more bloom nutrients.

What are high-CBD cannabis seeds?

CBD, or cannabidiol, is one of the chemical components—known collectively as cannabinoids—found in the cannabis plant. Over the years, humans have selected plants for high-THC content, making cannabis with high levels of CBD rare. The genetic pathways through which THC is synthesized by the plant are different than those for CBD production.

Cannabis used for hemp production has been selected for other traits, including a low THC content, so as to comply with the 2018 Farm Bill. Consequently, many varieties of hemp produce significant quantities of CBD.

As interest in CBD as a medicine has grown, many breeders have crossed high-CBD hemp with cannabis. These strains have little or no THC, 1:1 ratios of THC and CBD, or some have a high-THC content along with significant amounts of CBD (3% or more).

Seeds for these varieties are now widely available online and through dispensaries. It should be noted, however, that any plant grown from these seeds is not guaranteed to produce high levels of CBD, as it takes many years to create a seed line that produces consistent results. A grower looking to produce cannabis with a certain THC to CBD ratio will need to grow from a tested and proven clone or seed.

How to germinate marijuana seeds

Germination is the process in which a seed sprouts and begins to grow into a new plant. Also referred to as “popping,” germination is the very first step in starting your weed grow.

Marijuana seeds can be acquired from an array of sources and can vary in quality. For more info on how to buy marijuana seeds, check out our Guide to buying cannabis seeds.

Cannabis seeds require three things to germinate: water, heat, and air. There are many methods to germinate seeds, but for the most common and simplest method, you will need:

  • Two clean plates
  • Four paper towels
  • Seeds
  • Distilled water

Step 1

Take four sheets of paper towels and soak them with distilled water. The towels should be soaked but shouldn’t have excess water running off.

Step 2

Take two of the paper towels and place them on a plate. Then, place the marijuana seeds at least an inch apart from each other and cover them with the remaining two water-soaked paper towels.

Step 3

To create a dark, protected space, take another plate and flip it over to cover the seeds, like a dome.

Step 4

Make sure the area the seeds are in is warm, somewhere between 70-85°F.

After completing these steps, it’s time to wait. Check the paper towels once a day to make sure they’re still saturated, and if they are losing moisture, apply more water to keep the seeds happy.

Some seeds germinate very rapidly while others can take a while, but generally, seeds should germinate in 3-10 days. If it’s been two weeks and a seed hasn’t sprouted, it’s probably a dud and won’t sprout.

A seed has germinated once the seed splits and a single sprout appears. The sprout is the taproot, which will become the main stem of the plant, and seeing it is a sign of successful germination.

It’s important to keep the delicate seed sterile, so don’t touch the seed or taproot as it begins to split.

Transplanting germinated cannabis seeds

Once you see the taproot, it’s time to transfer your germinated seed into its growing medium, such as soil.

  • Fill a 4-inch or one-gallon pot with loose, airy potting soil
  • Water the soil before you put the seed in; it should be wet but not drenched
  • Poke a hole in the soil with a pen or pencil—the rule of thumb is: make the hole twice as deep as the seed is wide
  • Using a pair of tweezers, gently place the seed in the hole with the taproot facing down
  • Lightly cover it with soil

Keep a close eye on the temperature and moisture level of the soil to keep the seed happy. It’s very delicate at this stage. Use a spray bottle to water it—over-watering can suffocate and kill the delicate sprout.

Within a week or so you should see a seedling begin to grow from the soil.

Germinating cannabis seeds doesn’t always go as planned. Some seeds will be duds. Others will be slow and take longer to sprout. But some will pop quickly and grow rapidly.

This is the beauty of seeds—often, you can tell which plants or genetics will thrive right from the get-go. This will help you determine which plants you want to take cuttings from for clones or for breeding if you want to create a seed bank of your own.

How to sex a pot plant

Check out Johanna’s full video series on how to grow weed on Leafly’s YouTube .

As we’ve mentioned, cannabis is a dioecious plant, meaning male and female reproductive organs appear on different plants.

Because only female cannabis plants produce buds and you want them to focus all their energy on producing buds and not seeds, it’s important to identify and get rid of male weed plants so they don’t pollinate females. If females are pollinated, it will give you buds filled with seeds, making your weed harsh and unpleasant.

Cultivating males is important for breeders trying to cross new strains and genetics, but most people growing for buds will want to remove the males.

As mentioned above, you can skip the processing of sexing weed plants by growing with feminized seeds or clones.

If growing male and female cannabis seeds, they’ll start to show their sex organs, or “pre-flowers,” after 8-10 weeks from germination.

Cannabis plant sex organs appear on nodes, the points where branches grow off from the main stalk.

Males will have round balls—these will develop into pollen sacs, which will release pollen into the air when mature.

Females will have a round structure with long hairs—these hairs will develop into pistils, which will catch pollen in the air.

Pre-flowers can initially be extremely small and hard to identify with the naked eye, but you can use a magnifying glass to get a better look.

Can I grow a seed I found in a bag of weed?

Finding a cannabis seed in your stash is not ideal, but we’ve all been there before. Although much less common than it once was, it still happens. Sometimes you’ll notice one when grinding down some flower, or you’ll see one pop, spark, and crackle from the heat of a lit bowl.

These are referred to as “bagseeds” and whether or not you can grow one will depend on where it came from.

Is a bagseed good or bad?

Seeds found in finished cannabis buds can develop for a number of reasons. For example, a male plant may have accidentally pollinated a flowering female during the growing process. But more commonly, they’re a sign of stress and can be attributed to high temperatures during the final stages of flowering or an exaggerated spike in climate or environment.

Seeds can also form in plants with genetic disorders or instability, like hermaphrodites—plants that develop both male and female reproductive parts. Generally, stress and genetic disorders are viewed as bad, so temper expectations with any plant you start from a bagseed.

But sometimes you get lucky and find a mature seed in some really nice herb. Strains like the legendary Chemdog wouldn’t be possible without adventurous smokers planting and proliferating the seeds they found in a bag of kind bud.

So don’t discount bud because it has a seed or two in it. While not ideal, it could be the origins of the next great weed strain.

Ask yourself a few questions to decide if it’s worth the time and energy to grow the seed.

Was the seed found in good weed?

If you don’t like the flavor, effects, or even the look of the bud, then it’s probably not worth growing.

Are you ready to grow?

Growing marijuana takes a certain level of commitment: time, energy, and financial resources, so be sure you can commit to the whole process.

Is the seed viable?

For a seed to be viable, it must be mature enough to have a completely formed genetic blueprint, and it must be strong enough to germinate and pop through its hard casing and sprout its crucial taproot.

There are a few indicators that will give you a sense of whether the seed is worth germinating.

  • Tiger stripes—dark stripes on the seed which resemble veins on a leaf are generally good
  • Solid shell—a seed should be able to withstand a little pressure when pinched between your fingers; if it crumbles or cracks, it’s no good

Immature seeds tend to be light in color and have a soft outer shell.

In some cases, even if a seed isn’t completely mature, there’s still a chance it could be viable. But often these are extremely weak, take long to develop, and express other unfavorable characteristics. Growers usually discard weak plants to free up space.

You might also find a mature seed that has been physically damaged through poor handling, like rough trimming. In those cases, it probably isn’t worth the effort to try and germinate the seed.

But if the seed you found looks decent, you might as well germinate it and see what sprouts.

Time to germinate

Viable or not, there’s only one sure way to find out if a bagseed will grow. If you’re simply curious to learn and not as concerned with the overall outcome, you can plant a couple of bagseeds outside and see what happens.

If you’re ready for a more serious approach, make sure you have the space for a proper garden and pop the seeds to see what fruit they bear.

Even if your seed sprouts fast and grows vigorously, it still has roughly a 50/50 chance of being female and producing buds, instead of turning out to be a male.

Remember, once a seed germinates, the real work begins. Sexing, selecting, vegetative growth, flowering, and the eventual harvest all lie ahead.

How to buy cannabis seeds

Cannabis seeds can be found on numerous online seed banks, but note that it is illegal to bring seeds into the US and Customs will seize any cannabis seeds that they find in packages or on a person. In legal and medical states, you may purchase seeds at a dispensary.

Sponsored Content

The best seed banks are precious – they’re like a good barber or mechanic. Once you find a great one, you stay with them for years to come. You nurture the relationship and cherish their essential service.

After all, they help you grow weed.

With this in mind, we’ve looked at various cannabis seed stores online, putting together a list of our top 11 best seed banks with US shipping. All of our entries offer cannabis seeds at great prices in secret “stealth packaging”.

Sneaky, eh? Let’s get to it!

First Look
If you’re impatient and just want to know our top 10, here you go:

  1. 10 free seeds with your order – ILGM
  2. 80% germination guarantee – Crop King Seeds
  3. Over 1,500+ strains from 65 sellers – Seedsman
  4. Discounts for Bitcoin users – Marijuana Seeds NL
  5. Global discreet shipping – Quebec Cannabis Seeds
  6. UK-based weed seed bank – Gorilla Seeds
  7. Very large selection – Attitude Seed Bank
  8. 4.5 out of 5 on TrustPilot – Herbie’s Seeds
  9. Dutch cannabis seed bank – Amsterdam Marijuana Seeds
  10. Frequent offers & promos – Seed City

Why Trust Us? What Do We Know About Weed Seeds Anyway?

For years, we’ve acted as a bridge connecting weed growers to reputable online seed banks.

We have reviewed most if not all the major stores to buy cannabis seeds online; contrasting their features, quality, and shipping policies against each other to pick out the best marijuana seed banks for growers like you.

So yeah, we’re pretty knowledgeable.

Our Ranking Criteria

The strain and type of weed seeds you desire vary from grower to grower, but there are some things that ALL good cannabis seed banks need to have:

Seed Quality – Are the Seeds Actually Good?

Seed quality is the heart of weed growing.

Good seed quality will in turn guarantee high germination success and high quality of weed flowers and products. Quality is usually a sign of commitment to customers and long-term success in the seed bank space.

Discreet Shipping – Will Your Seeds Be Seized in the Mail?

Seed banks that ship in discreet packaging give an extra aspect to ensure the safety of your seeds, especially when shipping to areas where the legality of weed is hazy. Even where weed is legal, you don’t want everyone seeing the contents of your packaging.

The best seed banks will hide your marijuana seeds in everyday items like DVD cases, toys, and other casual-looking items.

Satisfaction Guarantees – Does the Seed Bank Offer a Guarantee?

Assurances are a measure of a seed bank’s confidence in its ability to meet its customer’s needs. Guarantees like a germination guarantee or delivery guarantee are important for customers to have trust in the services of seed stores.

If you have a germination guarantee, you can buy with way more confidence.

Now let’s move on to our top recommendations!

11 Best Seed Banks to Buy Marijuana Seeds with US Shipping

1. I Love Growing Marijuana – Best Overall Seed Bank

Choose for…

  • Discreet packaging
  • Guaranteed delivery
  • Free US shipping
  • Wide seed variety

Unfortunately

  • Doesn’t ship to Canada or the UK

Seeds offered: Beginner┃Autoflower┃High THC┃Indoor┃Outdoor┃Indica┃Sativa┃High Yield┃CBD Hemp

I Love Growing Marijuana is the Harvard of online seed banks. With a wide variety of growing guides to help both experienced and new marijuana growers get the most out of their seeds.

Not only does ILGM offer marijuana seeds, but you can also get tailored grow kits to ensure your seeds germinate and give high yields on top of a 100% germination guarantee.

Free shipping? Yes. You won’t have to pay a dime to ship to the US. And for orders above $150, you will get free shipping to Australia with an extra option to track your shipment!

Better yet, there’s stealth shipping, so you won’t have to worry about ogling custom officers’ eyes. And in case your delivery doesn’t get to you, you’re protected by a delivery guarantee; thus, another shipment will be sent to you for FREE.

The beauty is, you get 10 FREE seeds when you buy auto-flowering seeds and feminized marijuana seeds, with 24/7 grow support to fall on if you encounter some growing challenges.

2. Crop King Seeds – Best Canadian Seed Bank

Choose for…

  • 80% germination rate
  • Discreet delivery
  • Toll-free customer support
  • Multiple payment methods

Unfortunately…

  • Relatively higher prices

Seeds offered: Autoflower┃Feminized┃Regular┃CBD┃Mix and Match

Crop King Seeds has been catering to people’s cannabis seed needs since 2005, with over 40 strains of its seeds being sold in over 300 stores across Canada

It’s one of the best Canadian seed banks for sure!

The cool thing is, you get quite a good range of strains, especially with auto-flowering and feminized seeds. If you’re confused on what seed to grow, opt for the mix and match seeds and grow a number of strains simultaneously!

New grower? Don’t fret. There are many guide instructions to help you grasp the ins and outs of marijuana growing in no time. With 24/7 customer support on standby just in case, you need a helping hand.

The icing on the cake is an 80% germination guarantee; so you can confidently farm knowing your seeds will sprout in abundance.

Have I told you that you can get free worldwide discreet shipping on orders above $200, with 10 free seeds on orders above $420?

3. Seedsman – Great for Specialized Marijuana Strains Cannabis Seeds

Choose for…

  • Up to 20% discount on orders
  • Discreet shipping
  • Worldwide shipping
  • Multiple payment methods

Unfortunately…

  • Additional shipping charges

Seeds offered: Feminized┃Autoflowers┃Regular┃Fast strains

Seedsman rules the kingdom of specialized strains. They now breed their seeds too, with an additional stock of 1500 strains sourced from over 65 seed banks across the globe!

Not only do they offer popular seeds, but you can also get medical seeds that can help ease the symptoms of anxiety, pain, arthritis, fatigue, and more.

The website has a strain finder feature for you to give you the initiative to look up seeds according to desired characteristics like High THC. Cool, aye?

Their worldwide shipping seasons it more. You can order your seeds from wherever in the neck of the woods. And not have to worry about customs confiscating your package since there’s discreet shipping with an option to track your order.

To cap it off, you will get at least a free seed and a 25% discount + 4 free seeds on Bitcoin purchases.

4. Marijuana Seeds NL – Most Impressive Stealth Shipping

Choose for…

  • Guaranteed stealth shipping
  • Quality genetics seed testing
  • Extra seeds on every order
  • Multiple payment options

Unfortunately…

  • International shipping takes a few weeks

Seeds offered: Feminized┃Autoflowered┃Regular┃High CBD

Marijuana Seeds NL tout themselves as the Original Seed bank, having been cultivating and producing their own weed seeds genetics for over 20 years, with a good range of strain types.

On the website is an informative blog section where you can get the latest news in the world of weed, with growing guides to help you make informed weed farming decisions.

MSNL seems to make its bones with its superior guaranteed international stealth shipping options, so you won’t have to fret over prying eyes while your package is in transit.

Here are some cool current offers. You get free seeds on any order you make, a 40% discount on West Coast strains, and 15% off all Bitcoin purchases!

Depending on where you are, you can start getting free shipping from orders above 55 pounds, with pretty fast delivery in the UK and Europe. All this is covered with a refund policy.

5. Quebec Cannabis Seeds – Top Seed Bank for Fast Same-Day Shipping

Choose for…

  • Fast discreet shipping
  • Weekly sales and promotions
  • High CBD medicinal seeds
  • 24 hours shipping

Unfortunately…

  • No refund policy

Seeds offered: Autoflower┃Feminized┃CBD┃Mixed Packs┃Outdoor

Quebec prides itself on high-quality marijuana seeds with a wide variety of seed strains.

This is warranted by the fact that apart from seeds grown for recreational purposes, you can find high CBD medical seeds to promote your well-being. And hybrid seeds that don’t need that much care when growing.

You are guaranteed an 80% germination rate. Which is assuring enough, but you can also get growing kits to take the utmost advantage of your seeds’ growth potential.

For orders above $200, you’ll get fast free worldwide discreet shipping, with extra seeds on orders above $150.

To cap it all, Quebec seeds has some great positive reviews, with an impressive 4.5 Trustpilot score.

6. Gorilla Seeds – Impressive New 420 Seed Bank

Choose for…

  • 100% discreet packaging guarantee
  • Fast international shipping
  • Low-cost strains
  • Good range of seed variety

Unfortunately

  • No delivery guarantee

Seeds offered: Autoflower┃Feminized┃HighCBD

Gorilla Seeds might be a newbie compared to other banks for marijuana seeds, but it seems to have found a sweet spot between affordability and high-quality cannabis.

There is a blog section on the site to walk you through the know-how of gorilla seeds, so you understand what seeds are best for you.

On every order you make, you’ll get extra seeds. The bigger the order, the more seeds you get. Better yet, you get free discreet shipping for orders above 99 pounds, with guaranteed fast international shipping.

If your package is damaged during shipping, their refund policy allows you to initiate a return within the first 7 days.

Also, privacy is guaranteed, but you can opt to make anonymous orders on cash or Bitcoin purchases. With a 17% off on Bitcoin purchases!

7. Attitude Seedbank – Great Value Pot Seeds

Choose for…

  • Regular seed bank offers
  • Large seed variety
  • Affordable prices
  • Multiple payment methods

Unfortunately…

  • A few negative customer support reviews

Seeds offered: Feminized┃Regular┃Autoflowers┃Pick and Mix

Attitude Seedbank bill themselves as the connection between the best weed genetics and clients. With thousands of seed strains currently on stock.

There’s a blog section on the site to help you get the latest news on new arrivals, payment options, growing guides, and more.

Also, there’s worldwide shipping, so you will be able to get your delivery anywhere. With an option for discreet shipping, which comes with a delivery guarantee. So in case your shipment gets lost, you get a reshipment.

The cool thing is, there are monthly promotions and regular offers. And you can be among the first to get notified about promos if you sign up for their newsletter.

8. Herbies Seeds – Great Seed Bank for Feminized Seeds

Herbies Seeds has been in the world of quality cannabis seeds for over 10 years. With more than 3000 cannabis seeds for sale on their website!

You’ll get free shipping on orders above 100 pounds in the UK and Europe. With stealth shipping and an option to track your order, which is quite a sport in countries with restrictive weed regulations.

The cherry on top is that all orders come with extra seeds, and you get bonus seeds on every 20 pounds spent.

There have been concerns over slow customer service. However, Herbies Seeds still has a 4.5 Trustpilot score!

9. Amsterdam Marijuana Seeds – Great Autoflowering Pot Seeds

Looking for great high-quality autoflowering seeds? You’ve hit the jackpot with Amsterdam Marijuana, with 25 years of experience in quality seeds.

You will have free worldwide shipping on all orders. Yes, even ship to the US with stealth shipping on the side to keep off straying eyes.

New to cannabis seeds growing? Don’t be worried. There’s a growing guide, to hold your hand through this journey and mold you into a weed growing expert.

However, you might find the seeds a bit on the pricey side, but a good harvest awaits if you can look past that.

10. Seed City – A-List Bank for Unique Cannabis Seeds

For over 10 years, Seed City has been the home of unique cannabis seeds, complemented with affordable pricing.

Seed City offers frequent promos and offers. With extra seeds on every order and up to 30% discount on purchases currently.

Stealth worldwide shipping? Definitely! Shop without any qualms of customs seizing your package.

The website can be overwhelming to some users, but to counter that, how does a 4.8 Trustpilot score sound?

11. Rocket Seeds – Best Reputable Site To Buy Cannabis Seeds

Rocket Seeds tout itself as the one-stop-shop for high-quality hemp seeds. With free worldwide shipping on orders above $200, and discreet shipping to go along with it.

When buying cannabis seeds with Expected Registered Shipping, you get guaranteed delivery, with free reshipment on lost or confiscated shipments.

In case of any challenges, there’s 24/7 customer support, including a live chat feature to use while you shop.

There are no germination guarantees, but you have a great germination guide to ensure most of your seeds sprout.

Best Cannabis Seed Banks – FAQs

How Do Seed Banks Work In the USA?

Seed banks work by breeding, drying, and conducting quality-controlled testing on cannabis seeds to check for their genetic purity.

These banks then seal these seeds in moisture-proof bags/containers. When a purchase is made, the seeds are usually packaged in discreet packaging and shipped to the buyer’s delivery location.

Can I Legally Buy Cannabis in Any State?

Although you can buy weed in most US states for either medical or recreational use. You can’t legally buy cannabis in all the states; Still, you can legally buy cannabis for medical use in 36/50 states in the US. And you can buy cannabis for recreational use in 18 US states.

What Seed Banks Are Legit?

There are a couple of legit seed stores currently. However, your best seed bank bet would be I Love Growing Marijuana, Crop King Seeds, and Seedsman to get high-quality seeds, a wide variety of strains, good shipping policies and even growing guides.

What’s the Safest Way To Pay?

The safest way to pay for your cannabis seeds varies. Nowadays, using an external payment processor, credit card payments are quite safe to use on online cannabis seed banks, since the seed bank will receive your payment without your credit card details and the payment processor immediately destroys the customer data.

However, if you are still skeptical about credit cards; Bitcoin, Cash, and Bank transfers are also good payment methods that guarantee anonymity.

What Cannabis Seeds Should I Buy?

Buying cannabis seeds online largely depends on your needs as a grower:

If you are relatively new to the art of growing your cannabis, get beginner-friendly seed strains like:

  • Northern lights seeds
  • Cinex
  • THC Bomb seeds
  • AK-47 seeds
  • Zkittlez seeds

Growing these seed strains is easier since they are popular, with potent THC levels, and can be able to survive in relatively harsh weather conditions. Better yet, most are autoflowering. So you won’t have to always keep an eye on them.

You can get these cannabis strains on most of the reviewed seed stores, e.g. I Love Growing Marijuana, Crop King Seeds, Seedsman, and even Quebec Seeds.

However, if you are experienced in growing weed. Then you should try out;

  • Blue dream feminized
  • Sour diesel feminized
  • Chemdawg
  • Pink kush
  • Master kush

These cannabis strains will usually require specialized care like being grown in a mild protected environment to ward off pests and regular scrutiny. However, if you see them through that budding phase you are guaranteed dense beautiful buds with a powerful high.

You can get these high THC strains on cannabis seed banks like I Love Growing Marijuana, Crop King Seeds, Marijuana Seeds NL, and more.

The Takeaway: Which Cannabis Seed Bank Is Best?

Whether you’ve grown weed before or you are inexperienced in the field of growing marijuana, with these seed stores you are assured to get that fulfillment that comes with nurturing and smoking your weed.

I Love Growing Marijuana just seems to have the best all-around marijuana seed bank features, especially with its high-quality seeds, impressive stealth shipping, and a resourceful growing guide.

However, if you want to get a seed bank that ships fast in Canada, then Crop King Seeds is also a great choice. With Seedsman being another top-notch seed bank if a wide variety of specialized strains is something you might fancy.

Harvesting your weed is the most beautiful thing ever, but don’t be selfish, share the tips and ideas you’ve discovered with some friends and build a healthy weed community.

The news and editorial staff of the Bay Area News Group had no role in this post’s preparation.