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Hairy bittercress A native, annual to biennial plant found in open and cultivated ground, and on rocks and walls throughout the UK. Hairy bittercress is recorded up to 3,800 ft. It is a common 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. 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

A native, annual to biennial plant found in open and cultivated ground, and on rocks and walls throughout the UK. Hairy bittercress is recorded up to 3,800 ft. It is a common weed of gardens, greenhouses, paths, railways and waste ground. It is a particular problem in container-raised plants from nurseries and garden centres.

Hairy bittercress is variable in size and leaf shape. Waved bittercress, C. flexuosa, closely resembles hairy bittercress and is also variable in habit. It is usually annual or biennial but occasionally perennial. A related introduced weed, New Zealand bittercress, C. corymbosa, has become troublesome in polytunnels. It is similar in appearance to hairy bittercress and has the same explosive seedpods but is generally smaller.

Hairy bittercress is found in flower all through the year but mainly from March to August. It is automatically self-pollinated. Seed is shed in May and June and sometimes into the autumn. There are around 20 seeds per seedpod. The average seed number per plant is 600 but a large plant may yield several thousand seeds. Plants can be found in fruit for 8 months of the year.

There is little germination of the fresh seeds. The seed after-ripens at high temperatures. The higher the temperature the greater the temperature range at which subsequent germination will take place. Germination is increased by a period of dry storage.

Hairy bittercress seed germinates from April to December. There are peak flushes of seedling emergence from July to August and November to December but this varies in different years. Autumn is the main period of seedling emergence. Hairy bittercress can complete its lifecycle in 5-6 weeks. The cycle is longer in rich soils and shorter in poor ones. Seedlings can survive the severest frost.

Hairy bittercress forms a relatively persistent soil seedbank.

When the seedpods are ripe the seeds are dispersed explosively for up to 1 m if the plants are shaken by the wind or by weeding operations. The seeds become sticky when wet and can be spread on tools and clothing.

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Seedlings should be killed by early cultivations and regular hoeing to prevent hairy bittercress plants flowering and setting seed. Stem fragments are capable of re-rooting following cultivation in moist conditions. Hairy bittercress seedlings should be removed from container plants before the weed can set and shed seeds. The standing areas must also be kept weed-free. Improved drainage may discourage this moisture-loving weed.

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.

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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.

Our Crews

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 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.

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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.

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