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20 FASTEST Flowering Strains to Grow from Seed

Both autoflowering seeds and photoperiod strains. The fastest flowering cannabis strains to grow from seed to harvest. Ordered by quickest start to finish grow time.

Fastest Flowering Autoflower Strains

Sour Crack Auto

THE FASTEST autoflowering strain that Mephisto Genetics has ever grown, Sour Crack Auto finishes in only 7 weeks from seed (germination). Sour Crack Auto is made from Green Crack Auto and 24 Carat genetics. The short plants stay 20 to 28 inches tall, forming rock-hard, resinous buds in quick time. A great strain for commercial quality Sea of Green autoflower grows. High potency nuggets tested near 20% THC.

Flowering Time 7 weeks
Strain Breeder Mephisto Genetics
Pack Size 1/3/7/18 seeds
Yield Indoors: 30–60 g/plant
Outdoors: 60+ g/plant

Buy Sour Crack Auto Feminized Seeds

+ Speed Auto

+ Speed Auto by Sweet Seeds are among the quickest finishing autoflower seeds to grow, being ready to harvest at just 7 weeks from germination. This strain is comprised of the breeder’s own Critical Mass and Speed Devil #2 Auto genetics, bred for yield and deep aromatic properties. + Speed Auto does well both indoors and outdoors. The plants grow 20 to 35 inches in height, producing harvests up to 150 grams each. Tastes sweet, fruity, and cheesy.

Flowering Time 7 weeks
Strain Breeder Sweet Seeds
Pack Size 3/5/10/25/100 seeds
Yield Indoors: 350–500 g/m2
Outdoors: 30–150 g/plant

Buy + Speed Auto Feminized Seeds

Fast Bud #2 Auto

Fast Bud #2 improves upon Sweet Seeds’ Fast Bud line, a member of the Diesel family of cannabis. This award-winning sativa dominant autoflower strain is quick to mature at 7 to 8 weeks from seed. Only reaching 20 to 35 inches in height, the short plants are multi-branched and form a large number of bud sites, making it an easy strain to grow with very productive yields. Fast Bud #2 Auto has a sweet aroma, exotic taste, strong head high, and powerful body stone. 15–20% THC.

Flowering Time 7–8 weeks
Strain Breeder Sweet Seeds
Pack Size 3/5/10 seeds
Yield Indoors: 350–500 g/m2
Outdoors: 20–70 g/plant

Buy Fast Bud #2 Auto Feminized Seeds

Sweet Skunk Auto

Sweet Skunk Auto is one of Sweet Seeds’ best-yielding and most resinous autoflower weed strains. Genetically, it’s a hybrid of Early Skunk and Critical Mass, backcrossed twice to Early Skunk. The plants grow rapidly and get 24 to 35 inches tall, finished at just 7½ weeks from germination. Its buds are dense and covered in trichomes. Intense skunk aromas with a sweet and spicy background. Physically relaxing with an uplifting head high. 16–20% THC.

Flowering Time 7½ weeks
Strain Breeder Sweet Seeds
Pack Size 3/5/10/25/100 seeds
Yield Indoors: 400–550 g/m2
Outdoors: 35–150 g/plant

Buy Sweet Skunk Auto Feminized Seeds

Alaskan Purple Auto

Alaskan Purple Auto by Seedsman, one of the best seed banks, is a 90% indica purple weed strain that produces good yields in a short time. It finishes growing at 8 weeks from seed, with some phenotypes ready to harvest at week 7. They are easy growing, sizable plants for an autoflowering strain that mature one week later when grown outdoors. Ripe, fruity sweet flavors, and 15–20% THC content.

Flowering Time 7–8 weeks
Strain Breeder Seedsman
Pack Size 1/3/5/10/100 seeds
Yield Indoors: 400–550 g/m2
Outdoors: 40–200 g/plant

Buy Alaskan Purple Auto Feminized Seeds

Crystal Candy XL Auto

Crystal Candy XL Auto is a large autoflowering marijuana strain bred from tall phenotypes of Sweet Seeds’ Crystal Candy Auto line. This mostly sativa variety is suitable for both indoor and outdoor growing. The plants reach a height of 35 to 55 inches, ready for harvest only 8 weeks from seed. Its buds are packed with trichomes and have a very fruity scent. 14–19% THC.

Flowering Time 8 weeks
Strain Breeder Sweet Seeds
Pack Size 3/5 seeds
Yield Indoors: 425–650 g/m2
Outdoors: 60–300 g/plant

Buy Crystal Candy XL Auto Feminized Seeds

Sweet Gelato Auto

Sweet Gelato Auto by Sweet Seeds is an autoflowering version of one of the most prestigious cannabis strains from the Bay Area—Gelato (Sunset Sherbet x Girl Scout Cookies “Thin Mint”)—crossed to Killer Kush Auto. The resulting plants offer generous yields in just 56 days from germination. Its dense buds are covered in large trichomes. The scent is earthy, sweet, and fruity with hints of mint and citrus. 18–23% THC.

Flowering Time 56 days
Strain Breeder Sweet Seeds
Pack Size 3/5 seeds
Yield Indoors: 375–500 g/m2
Outdoors: 50–175 g/plant

Buy Sweet Gelato Auto Feminized Seeds

Sweet Cheese XL Auto

Sweet Cheese XL Auto is a fast and furious Cheese strain that offers greater size, yield, and resin production than Sweet Seeds’ original Sweet Cheese Auto. This mostly sativa strain autoflower is ready to harvest at 8 weeks from seed, growing to a height of 30 to 55 inches. It has an intense, remarkably sweet, skunky scent and powerful yet relaxing high. 15–20% THC.

Flowering Time 56 days
Strain Breeder Sweet Seeds
Pack Size 3/5/25/100 seeds
Yield Indoors: 375–600 g/m2
Outdoors: 45–190 g/plant

Buy Sweet Cheese XL Auto Feminized Seeds

Purple Punch Auto

Purple Punch Auto is a fast, productive, and flavorful autoflower variety sold by Barney’s Farm Seeds. A top performer indoors and out, this low-maintenance, mostly indica strain shows resistance to mold, mildew, mites, and cold weather. The plants max out at 31 inches tall over their short lifecycle that takes between 50 to 60 days from seed. Its colorful, dense buds are rich in resin and terpenes with scents of sweet apple pie and cloves. Up to 18% THC.

Flowering Time 50–60 days
Strain Breeder Barney’s Farm Seeds
Pack Size 1/3/5/10 seeds
Yield Indoors: 350 g/m2
Outdoors: 400 g/plant

Buy Purple Punch Auto Feminized Seeds

Chocolate Skunk Auto

A “60-day wonder” strain being ready to cut 60 days from seed germination, Chocolate Skunk Auto by 00 Seeds is an autoflowering hybrid of Chocolate Skunk and ruderalis genetics. The plants grow large for an auto strain at over 40 inches tall. Chocolate Skunk Auto produces beautiful compact, crystal-covered buds that smell great. 17% THC.

Flowering Time 60 days
Strain Breeder 00 Seeds
Pack Size 3/5 seeds
Yield Indoors: 250–350 g/m2

Buy Chocolate Skunk Auto Feminized Seeds

Fastest Flowering Photoperiod Strains

Gigabud

Gigabud is a Big Bud and Northern Lights hybrid that finishes flowering in a speedy 5 to 6 weeks. These thirsty, medium-sized plants grow vigorously in veg and flower, producing massive quantities of resinous, fruity buds. There is also an autoflowering Gigabud strain for sale.

Flowering Time 5–6 weeks
Strain Breeder G13 Labs
Pack Size 5 seeds
Yield 450+ g/m2

Buy Gigabud Feminized Seeds

Hash Plant

The famous Sensi Seeds Hash Plant indica originates from Afghani genetics bred in the Northwest United States that was brought to Sensi Seeds in Holland, where it was crossed to another Afghan variety—Northern Lights. Ready to harvest in as quick as 40 days from flowering, Hash Plant seeds grow fast, in a stout, thick manner. The buds are super dense, very sticky, and ideal for making hash. A good choice for breeders.

Flowering Time 40–45 days
Strain Breeder Sensi Seeds
Pack Size 10 seeds
Yield 400–500 g/m2

Buy Hash Plant Regular Seeds

Green Poison Fast

Green Poison Fast by Sweet Seeds is a top-quality weed strain that forms super frosty and tight buds. This unique feminized seed strain was made by breeding out the ruderalis gene present in the original autoflowering Green Poison to create a remarkable, high-yielding photoperiod variety. 70% indica genetics are responsible for its fruity, heavy, and dank marijuana buds.

Flowering Time 6 weeks
Strain Breeder Sweet Seeds
Pack Size 3/5/10/25/100 seeds
Yield Indoors: 500–600 g/m2
Outdoors: 500–700 g/plant

Buy Green Poison Fast Version Feminized Seeds

Passion #1

Passion #1 is an outdoor indica strain from the seventies in California that made its way over to Holland during the eighties. This stable, easy-to-grow regular seed strain gets huge both outdoors and indoors, finishing its flowering cycle in a mere 6 weeks of bloom time. Passion #1’s citrus-like buds are long, dense, and full of resin. 18.6% THC content.

Flowering Time 6 weeks
Strain Breeder Dutch Passion
Pack Size 10 seeds
Yield 250–750 g/plant

Buy Passion #1 Regular Seeds

Tropicanna Poison F1 Fast

Tropicanna Poison F1 Fast by Sweet Seeds is an excellent fast flowering strain bred for speed and potency. It was created using an elite Tropicanna Cookies clone crossed to a red flower phenotype and Red Poison Auto. Roughly 80% of the resulting plants get red bud coloring. This very productive variety is finished at only 6 to 7 weeks of bloom. The buds are dense, extremely resinous, and have intensely sweet scents and flavors. 16–24% THC.

Flowering Time 42–49 days
Strain Breeder Sweet Seeds
Pack Size 3/5 seeds
Yield Indoors: 450–600 g/m2
Outdoors: 400–650 g/plant

Buy Tropicanna Poison F1 Fast Feminized Seeds

Big Nugs Fast

As the name suggests, Big Nugs Fast grows big nugs—fast. It’s a photoperiod hybrid that’s ready to harvest in only 6 to 7 weeks flowering time. This high yield weed strain is bred from Big Bud / Critical Mass (Afghani x Skunk) crossed to Seedsman’s fast-finishing male. Similar to Big Bud, Big Nugs Fast grows thick heavy buds, which may need to be propped up during flowering. Yields are high—expect dense, pine cone-shaped buds with fruity, hashy qualities.

Flowering Time 6–7 weeks
Strain Breeder Seedsman
Pack Size 1/3/5/10/100 seeds
Yield 450–550 g/m2

Buy Big Nugs Fast Feminized Seeds

C99 x Blueberry Fast

C99 x Blueberry Fast is a rapid flowering, mostly sativa weed strain that’s ready to harvest in just 45 days from the start of bloom cycle. The infamous C99 strain is crossed to Blueberry and then bred with Seedsman’s fast parent, resulting in sativa dominant seeds that finish quickly. Its Thai genetics present help C99 x Blueberry Fast grow big during flowering, so expect some stretching. High yields of thick, potent marijuana buds.

Flowering Time 6–7 weeks
Strain Breeder Seedsman
Pack Size 1/3/5/10/100 seeds
Yield 350–450 g/m2

Buy C99 x Blueberry Fast Feminized Seeds

Gorilla Girl F1 Fast

Gorilla Girl F1 Fast by Sweet Seeds is an extra-fast version of Gorilla Girl featuring extreme potency and production. The sativa dominant plants are ready to harvest after just 7 weeks of flowering. Its buds are known for their high resin content, with calyxes completely covered in frosty trichomes. The aroma and taste are sweet and fruity with earthy, woody notes. Strong effects—up to 24% THC.

Flowering Time 49 days
Strain Breeder Sweet Seeds
Pack Size 3/5 seeds
Yield Indoors: 400–500 g/m2
Outdoors: 350–600 g/plant

Buy Gorilla Girl F1 Fast Feminized Seeds

Pineapple Express #2

Pineapple Express #2 is a faster flowering, higher-yielding version of G13 Lab’s original Pineapple Express. A favorite weed strain among growers in humid climates, Pineapple Express #2 grows huge outdoors and has high resistance to mold and moisture. Its buds are large, fruity, and full of trichomes.

Flowering Time 45–50 days
Strain Breeder G13 Labs
Pack Size 5 seeds
Yield Indoors: 700 g/m2
Outdoors: 900–1300 g/m2

Buy Pineapple Express #2 Feminized Seeds

Pakistan Valley

Originating from the Hindu Kush mountains, Pakistan Valley by WOS is a landrace pure indica cannabis strain that grows quickly, finishing its flowering phase in just 45 to 55 days. It is a compact, vigorous grower, especially suited towards dry climates where its buds bulk up dense and resinous. Super sticky and potent—over 20% THC. For sale as both regular and feminized seeds.

Flowering Time 45–55 days
Strain Breeder World of Seeds
Pack Size 10 seeds
Yield Indoors: 400 g/m2
Outdoors: 700 g/m2

Buy Pakistan Valley Reg / Fem Seeds

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13 thoughts on “20 FASTEST Flowering Strains to Grow from Seed”

Consider Bubba’s gift from Humboldt seeds. 6 weeks flowering and nice purple hues

Im growing Bubbas Gift this season and it hasnt started to show sex yet. Just hope its done before the 1st week of October. Weather in the North East US can get really crappy in Oct . Anybody else out there have experience with this strain?

Speedy Chile fast by royal Queen is the fastest I’ve heard of. It’s finished in 56 days from germination and only needs 14 days veg. 16% Thc. Fem photo 80-100cm tall and 500+ grams per m2 indoor. Critical poison fast should be on the list too. Finished in 40-45 days 18% thc Fem photo 500+ grams per m2 indoor.

HI bro, how many plants per m2 can u grow with these??

Wow. This is a real treat for both the consumers and the farmers. Personally, I like Green-O-Matic Auto. It sorts of suits me. Thanks a lot for sharing.

Pineapple Express #2 from G13 Labs all day on my 3rd run with this strain and I have more chasing it

Bro, i have a special pheno of her, been runnin her for like 4 years now.. Its amazing what she does in just 50 days… I like to run an extra 10 days though…

got some free seeds from just cannabis seeds and so I thought I would throw a few of them in the dirt, only one was fem and a hearty little sativa that I topped 3 times for max yield and about 45 days in it looked like I was well on my way to getting 1/2 lb off of her when the buds fattened up in coming weeks considering I had about 4 more weeks before harvest, but just for fun I thought I would check the trichomes at a time I felt was early, and WTF. I’m sitting on 15 to 40% amber and no clear trichomes, in 45 days, on a pure sativa!! Well my yield wont be as big but its an early surprise. Wish I would have cloned her,

Just leave a couple small buds and regenerate growth after your harvest.

Lemon Pie Auto takes 3 months/12 weeks seed to buds

Gorilla Girl F1 Fast is my favorite. Not sure if anyone likes it too.

Fast Bud #2 Auto seems one of the exciting options. But I haven’t tried it. Can anyone share how exactly would it be?

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10 Fast-Growing Cannabis Flowers for Impatient Gardeners

Growing cannabis can be an arduous process. Beyond the space, materials, and nutrients needed, time and light are the most essential ingredients in the cannabis cultivation equation. But what if you’re impatient or short on time? Is there a way to speed up the growing process?

Historically, black market growers would seek out or hybridize strains to harness attributes that catered to their surreptitious needs. These plants would usually be short and stalky with larger-than-average yields, and in some instances they would be autoflowering (such as a ruderalis hybrid). They were designed to be fast-flowering for both a quick turnover and so they could be easily relocated from time to time.

The fast-flowering cannabis strains listed below are now emerging for professional and hobby growers to utilize. They’re perfect for novice growers as well as set-it-and-forget-it growers who want to squeeze out a harvest with little time to spare. The list includes a mixture of both photoperiod and autoflowering varieties so you can find the perfect plants for your setup.

Photoperiod Strains That Grow Quickly (7-9 Weeks)

Lowryder

Lowryder is a hybrid strain that was inbred for nine generations by Joint Doctor Seeds to give it a dwarfed size. Growing no more than 16 inches tall, it’s the cannabis equivalent of a bonsai for the discrete grower’s windowsill or balcony. Lowryder’s small size comes from a species of cannabis ruderalis crossed with Northern Lights #2 and then William’s Wonder. Consumers, be patient with this strain: its medicinal and cerebrally stimulating effects have a slow but powerful onset. A mild earthy aroma radiates from the small, conic buds which autoflower in a short 40 to 45 days. Lowryder is a stalwart plant that can survive in harsh, colder climates, making it a popular strain in northern regions like Finland and Canada.

Critical Kush

Critical Kush from Barney’s Farm is a mostly indica strain that blends together two famed cannabis staples, Critical Mass and OG Kush. Aromatic notes of earthiness and spice usher in a calming sensation that relaxes the mind and body. Critical Kush pairs a staggeringly high THC content with a moderate dose of CBD, making this strain a perfect nighttime medication for pain, stress, insomnia, and muscle spasms. Growers cultivating this strain indoors will wait 50 to 60 days for Critical Kush to complete its flowering cycle.

Early Girl

Early Girl is the wallflower of cannabis strains since its introduction in the 1980s. Lovingly preserved by the breeders at Sensi Seeds, this strain is lazy and relaxed, nothing over the top. A 75/25 indica-dominant hybrid, Early Girl is a good one for those new to cannabis who would like relief from stress. Also a great strain for novice growers, it’s compact, resilient, and has a particularly short flowering time of 7 to 8 weeks. Early Girl grows especially well outdoors, but won’t put up a fuss if she’s stuck inside.

OG Kush

OG Kush makes up the genetic backbone of West Coast cannabis varieties, but in spite of its ubiquity, its genetic origins remain a mystery. Popular myth maintains that Chemdawg and Hindu Kush parented OG Kush, passing on the distinct “kush” bud structure we see in many strains today. However, we can’t be sure because OG Kush first came from bag seed in the early 90s. The earliest propagators (now known as Imperial Genetics) are said to have brought the seeds out of Florida to Colorado and southern California, where it now flourishes. There are many different phenotypes of OG Kush, some of which include Tahoe OG, SFV OG, and Alpha OG.

OG Kush is cherished for its ability to crush stress under the weight of its heavy euphoria. It carries an earthy pine and sour lemon scent with woody undertones, an aroma that has become the signature of OG Kush varieties and descendants. With OG Kush, patients most commonly cite improvements in migraines, ADD/ADHD, and stress disorders.

Superglue

Superglue is a hybrid strain bred by Seedism Seeds. A cross between Afghani and Northern Lights, Superglue inherits indica growth patterns along with a sweet caramel and pine aroma. Superglue brings calming relaxation to the mind and body, but leaves you functional and energetic enough for social activities or a productive afternoon.

Autoflowering Strains That Grow Quickly (7-12 Weeks)

Red Dwarf

Red Dwarf is a rarer strain of cannabis that is an autoflowering plant. This trait comes from its cannabis ruderalis genetics, which is a third variety of the plant that’s usually not bred due to its lower THC content. The wonders of selective breeding from Buddha Seeds have resulted in seeds that grow to adulthood in an incredibly short six weeks. This strain’s squat, small plants are easy to grow in smaller spaces, making it a popular choice for growers who want something simple and fast. Indica-dominant, Red Dwarf will eventually make you sleepy, but not without some relaxed euphoria first.

Hobbit

Hobbit by Kannabia Seeds is a resilient autoflowering variety with sweetness and strong elemental resistance. This strain has a sweet aroma that has been described as “strawberry candy” and an equally sweet smoke with latent earthy notes. Hobbit deftly combines stimulating Haze elements with a pervasive body buzz that is lightly weighted while remaining pleasant and functional. Many growers covet this autoflowering wonder for its quick 65-day flowering time and above-average yield.

White Ryder

White Ryder is Riot Seeds’ attempt to create a ruderalis version of White Widow by crossing Buddha Seeds’ White Dwarf against Lowryder. By blending two stout, autoflowering plants, Riot Seeds created a potent indica-dominant hybrid that finishes in under 80 days and can easily be hidden from view. Enjoy this flower for anti-anxiety and sleep-inducing effects.

Purple Cheese

Purple Cheese is an indica-dominant autoflowering hybrid that combines Purple #1, Blue Cheese, and Lowryder. Bred by Auto Seeds, Purple Cheese was designed to have a sweeter, less cheesy flavor than its Blue Cheese parent. It does, however, inherit a tight bud structure and a high CBD profile. With a palatable fruit aroma, Purple Cheese delivers powerful full-body effects best suited for night owls or patients treating pain. Colder climates will bring out this hybrid’s purple hues, and for best results, growers should keep this autoflowering variety between 50-80 cm in height.

Royal Haze

Royal Haze (or Royale Haze) by Dinafem Seeds is a mostly sativa strain bred from Skunk, Haze, and Northern Lights genetics. Taking after her Haze parent, this sativa inherits a spicy citrus flavor and buzzing, energetic effects that keep you alert and productive throughout the day. Outdoor growers will appreciate her flexibility and resilience even when the temperature drops, although her 10-11 week flowering cycle demands a bit of patience.

An autoflowering rendition of Royal Haze was bred by Royal Queen Seeds, who mixed Amnesia Haze, Skunk, and a ruderalis strain. Its effects are similarly energizing and cerebral.

The Best Fast-Flowering Cannabis Seeds for Outdoor Growers

Outdoor growing can be unpredictable, making fast-flowering a must.

With too many varieties to choose from out there, it can be difficult to sift through all of the options for a fast flowering cannabis seed for your outdoor grow. Fortunately, there are plenty of fast-flowering seeds out there to help outdoor growers hedge against the uncertainty of outdoor conditions. These genetically programmed beauties are the quickest strains available and can finish flowering in as little as seven to eight weeks. But don’t worry: faster flowering speeds don’t have to mean a lower quality grow. These strains still have high potency, quality and yield; you will just realize these benefits faster! Fast seeds are the answer for growers in northern climates and shorter growing seasons, or for anyone that just wants to get to the finish line a bit faster than their competition.

Northern Lights #5 Fast

This quick-growing version of its namesake flowers a few weeks sooner than the original Northern Lights #5 (NL5). This strain originates from Afghan Indica genetics and as such is a smaller plant that produces highly resinous flowers. It is the perfect choice for those living in areas with early frost dates.

AK-47 Fast

Like the Northern Lights #5, the AK-47 Fast is a strain of the species that has a short grow time of seven weeks to the onset of inflorescence. This strain produces dense, Indica-like buds with high yields, and sweet, earthy tastes.

Sunset Sherbet

Don’t let the lack of the word “fast” in its name deter you. Sunset Sherbet can be flowering as soon as week seven, but definitely by week nine. This particular variety may be better suited for the grower with some experience behind them, but the daring newbie may fare just fine with it as well if starting with feminized seeds. Sunset Sherbet is similar to Girl Scout Cookies and boasts abundant trichomes.

Black Domina

Like Sunset Sherbet, even though the name may not imply it, this strain can flower between weeks seven and nine. Further benefits to this variety are that feminized seeds of this strain are relatively low maintenance plants that are resistant to many pests and diseases that can sometimes affect other cannabis strains. As a further bonus, expect sticky buds with incredible aromas.

Auto-Super Lemon Haze

Shorter than Critical Kush (below), Super Lemon Haze is a strain that grows up to four feet (1.2 meters) tall. A great combination of Sativa, Indica and wild cannabis (ruderalis), Super Lemon Haze will start flowering as early as week three and is harvestable by week nine, making it among the fastest strains around.

Tahoe Kush

Another strain with strong resistance to diseases such as mold and mildew, Tahoe Kush is a THC- dominant strain with levels as high as 20-25%. Outdoor growers can expect yields of this strain of about 10 to 12 ounces (about one-fourth to one-third of a kilogram) of product per plant. Expect flowering at about nine to 10 weeks.

Chocolope

This strain is capable in flowering in as few as eight weeks and like Sunset Sherbet, Chocolope may be better grown by a more experienced grower unless feminized seeds are used. A Sativa selection, Chocolope offers high yields.

Auto-Critical Kush

Autoflowering strains like Auto-Critical Kush and Super Lemon Haze (above) are good choices for growers that may not be fully in tune yet to the cannabis lifecycle. These strains will “automatically” switch from vegetative stage to flowering stage, regardless of light levels. Auto-Critical Kush is a hybrid of wild cannabis strains and will be harvestable for outdoor growers by late summer.

Blueberry

This unique strain, which has a definite blueberry taste and aroma, is among the quicker flowering strains available. It is regarded as one of the most beneficial strains of cannabis in the medicinal marijuana community, and is valued as well for its red, purple and blue hues and large, crystallized buds.

We hope this list included some fast-flowering options to consider for your outdoor grow. You can find more options at Seed King.