Late winter and spring signal growth of all plants but especially weeds, like hairy bittercress weed. What is hairy bittercress? This article explains more as well as how to keep the weed under control. Hairy bittercress is a winter annual weed that germinates in the cool moist conditions of late fall. Seed pods pop and fly everywhere when lightly touched. Hairy bittercress is an annual weed that can spread quickly.
Hairy Bittercress Killer: Learn More About Control For Hairy Bittercress
Late winter and spring signal growth of all plants, but especially weeds. Annual weed seeds overwinter and then burst into growth towards the end of the season. Hairy bittercress weed is no exception. What is hairy bittercress? The plant is an annual weed, which is one of the earliest to sprout and form seeds. Control for hairy bittercress starts early in the season, before flowers turn to seed and get a chance to spread.
What is Hairy Bittercress?
Hairy bittercress weed (Cardamine hirsuta) is an annual spring or winter pest. The plant springs from a basal rosette and bears 3 to 9 inch (8-23 cm.) long stems. The leaves are alternate and slightly scalloped with the largest at the base of the plant. Tiny white flowers develop at the ends of the stems and then turn into long seedpods. These pods split open explosively when ripe and fling seeds out into the environment.
The weed prefers cool, moist soil and is most prolific after early spring rains. The weeds spread quickly but their appearance reduces as temperatures increase. The plant has a long, deep taproot, which makes pulling them out manually ineffective. Control for hairy bittercress is cultural and chemical.
Preventing Hairy Bittercress in the Garden
This pesky weed is small enough to hide among your landscape plants. Its extensive seed expulsion means that just one or two weeds can spread quickly through the garden in spring. Early control for hairy bittercress is essential to protect the rest of the landscape from an infestation.
Prevent invasions into turf areas by encouraging good grass growth. The weeds easily infest thin or patchy areas. Apply several inches (8 cm.) of mulch around landscape plants to help prevent seeds from getting a foothold in your soil.
Cultural Control for Hairy Bittercress
Pulling out hairy bittercress weed usually leaves the root behind. The plant will re-sprout from healthy weeds and the problem persists. You can, however, use a long slim weeding tool to dig down and around the taproot and get all the plant material out of the ground.
Mowing will achieve control over time. Do it frequently enough that you remove the flower heads before they become seed pods.
As temperatures get warmer, the plant will die naturally without having reproduced. That means fewer weeds the following season.
Chemical Hairy Bittercress Killer
Severe infestations of hairy bittercress weed will require chemical treatment. Herbicides applied post emergence need to have two different active ingredients. The ingredients must be 2-4 D, triclopyr, clopyralid, dicamba, or MCPP. These are found in broadleaf herbicide preparations known as two, three, or four-way treatments.
The higher number preparations will kill a wide range of weeds. The two-way herbicide should be sufficient for your purposes unless you have a field full of a variety of weed pests as well as the hairy bittercress weed. Apply your chosen herbicide in spring or fall.
Weed That Shoots Seeds
Updated July 15, 2021
We continue to offer our full range of plant health care, lawn care, and tree care services throughout central New Jersey and eastern Pennsylvania.
Business hours are back to normal (see our hours here), we take the necessary precautions to prevent the spread of Covid-19, and are always receptive to your preferences for personal interaction.
Updated April 29, 2020
As an essential business, we continue to operate under our normal business hours.
Our crews are working every day to remove and prune trees, perform safety inspections, spray for ticks and mosquitoes, apply lawn and tree treatments, and address any other aspects of tree, shrub, or lawn care.
We’re available 24/7 for emergency tree work, and we’re always available by phone or email to answer your questions or discuss any issues with your trees or lawn.
As a reminder, our arborists and crew members won’t ring your doorbell (we’ll text you when we arrive on your property). Anyone you interact with will be wearing a mask and staying at least 6 feet away from you. You can see more details below in our earlier update.
Thank you for your continued support during these difficult times. And, if you can, we encourage you to get outdoors and enjoy the spring flowers and new green leaves – we all need a little beauty in our lives these days.
Updated March 23, 2020
Under the Governor’s “stay-at-home” order on 03/22/20, tree care and tree work can continue as long as tree care businesses follow social distancing recommendations. As an “essential service”, we are working hard to make sure our customers’ trees are safe and well-maintained.
We take the health and safety of our customers and employees very seriously, and have consulted with the NJ Board of Tree Experts, International Society for Arboriculture, and the Tree Care Industry Association to make sure that we are following best practices. As a result, we’ve enacted the following additional precautions to help prevent the spread of the coronavirus in our local communities.
On Your Property
When one of our arborists arrives to inspect your tree(s) and provide an estimate, they will call or text to let you know they’ve arrived (rather than ringing the doorbell). You can stay indoors and communicate by phone while our arborist is on site. If you’d prefer to come outside, we will ensure that the recommended 6-foot distance is maintained.
As always, proposals and work orders will be sent to you by email; we don’t provide hand-written estimates.
You can accept a proposal directly through the link in the email, through the Customer Portal on our website, or by calling the office.
When our crews are on your property, they work independently. You do not need to be home or have any direct contact with them.
We are closely monitoring all employees for any signs of illness. Each team member knows that they should go home immediately if they feel unwell, or stay home if they’re at all concerned. If anyone becomes ill, we will all follow the CDC’s recommendations.
We’ve provided an abundance of alcohol wipes and latex gloves for each employee, are ensuring that they follow the recommended handwashing and disinfecting protocols, and have reinforced that they should maintain as much distance from each other as is practical while at work.
In the Office
In the office, Joy is working tirelessly to keep up with the spring demand and is continuing to schedule appointments for estimates. We’re experiencing a high volume of phone calls so ask for your patience as we try to get to everyone.
Scheduling and ongoing work have so far not been affected. If it becomes necessary to reschedule, we will let you know.
Hairy bittercress: A weed to watch out for
Hairy bittercress is an annual weed that can spread quickly.
Flowers and seed pods of hairy bittercress. Photo by Lori Imboden, MSU Extension.
Have you recently noticed plants with small, white flowers on the edges of your lawn, flowerbeds and rock pathways? During April and May, populations of the winter annual weed hairy bittercress (Cardamine hirsuta) become increasingly visible. Hairy bittercress has a low growing rosette similar in form to a dandelion. It raises its profile in early spring with the appearance of flowers and seeds on a vertical stem. Like many members of the mustard family, hairy bittercress sets seed prolifically. It grows quickly and a few plants or seeds can generate a more widespread infestation in even a year’s time.
The first true leaves of hairy bittercress are heart shaped. Photo by Erin Hill, MSU.
Hairy bittercress is a winter annual weed. Its seeds germinate in fall beginning as early as September. The first true leaves are heart-shaped, followed by compound leaves with two or more pairs of leaflets and a kidney shaped terminal leaflet. The leaves that emerge in the fall form a small rosette that will overwinter. Once the weather warms in spring, it sends up stalks of small, white flowers followed by slender seed pods known as siliques.
Hairy bittercress leaves have two or more pairs of leaflets and a kidney shaped terminal leaflet. Photo by Lori Imboden, MSU Extension.
Once the seed pods ripen, disturbing the pods can propel the seeds as far as 16 feet from the mother plant. This seed dispersal adds to the soil seed bank and primes the area for another infestation to emerge in early fall. After setting seed, the life cycle is complete and the plants die. Hairy bittercress and other winter annual weed species, like common chickweed and purple deadnettle, are not typically present during the summer months.
Once the seed pods ripen, disturbing the pods will send the seeds flying as far as 16 feet. Photo by Lori Imboden, MSU Extension.
Hairy bittercress is best managed mechanically when it is young. Remove it by hand, hoe or tillage in early fall or early spring before it sets seed. If plants are flowering, composting is discouraged as seeds may develop. To manage this weed using herbicides, the proactive approach would be to use a pre-emergence herbicide in the late summer (late August to early September) to target the plants at the time of germination and prevent successful emergence.
If plants have already emerged, applying a post-emergence herbicide to actively growing plants before seedpods form may be effective. If using an herbicide, be certain it contains an active ingredient that will target this weed. Always read and follow all labeled instructions to increase effectiveness and prevent personal or environmental harm.