Weed of the Month: Hairy Bittercress
As winter warms to spring, a favorite weed of foragers starts to emerge in rather cute clumpsвЂ”itвЂ™s hairy bittercress! It has actually been lurking near the surface all winter, having germinated in the fall and waited out the cold temperatures before sending up flowers and seeds.
Hairy bittercress (Cardamine hirsuta) leafs out in a basal rosette, and like other members of the mustard family (Brassicaceae), its tender greens are edible. DonвЂ™t be fooled by the common nameвЂ”its flavor is mild and peppery, not bitter. Though the flowers can be tough to chew, the tender leaves are suitable for a chic microgreens salad and have tons of vitamin C, calcium, magnesium, beta-carotene, and antioxidants.
The flower stalks shoot up above the rosette, topped with clusters of tiny, cross-shaped white flowers. Indeed, the former name for the family is Cruciferae, a reference to the crucifix pattern of the petals common in that familyвЂ™s flowers. However, when I was little, I remember thinking these tiny flowers looked like frosty pixie wands or fairy crowns, at once earthy, tough, regal, and whimsical.
More: Learn to identify more weeds and find out more about each one by browsing the Weed of the Month archive.
While urban grazers will be most focused on the leaves, I think the seed capsules are the best part of hairy bittercress. Called siliques, they look like purplish-green toothpicks standing upright around the flower. As the seeds mature, the pods begin to coil tightly untilвЂ”pop! A gentle touch or passing breeze triggers the pods to explode and send the seeds flying as far as three feet from the mother plant. This ballistic dispersal strategy, known as ballochory, is also employed by jewelweed and cranesbill.
Though hairy bittercress is originally from Eurasia and was introduced to North America, there are several species of Cardamine that are native to the United States. Several are listed as threatened or endangered, mostly due to habitat loss.
Hairy bittercress is adapted to moist, disturbed soils, so it emerges wherever we irrigate. Unsurprisingly, then, itвЂ™s a common lawn weed (where it can form expansive mats) as well as a greenhouse weed (where it pops up in and around containers). Mowing and hand weeding are the typical means of controlвЂ”the shallow fibrous roots make it an easy pull. If you do pull some from your garden beds, consider making a farmerвЂ™s sandwich of cheese, apples, and a bit of fresh bittercress. Skip the compost pile and send it your stomach instead!
The Weed of the Month series explores the ecology and history of the common wild plants that most gardeners consider weeds.
Browse the Weed of the Month archives >
Saara Nafici is the executive director of Added Value/Red Hook Community Farm. She is also the former coordinator of the Garden Apprentice Program at Brooklyn Botanic Garden and a longtime activist, feminist, bicyclist, naturalist, and youth educator. Follow her weedy plant adventures on Instagram.
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Birds of Brooklyn: Pine Warbler вЂє
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While this plant can be edible, it is also a very invasive weed here in the Missouri Ozarks where I live. I spent 2-1/2 hours pulling it one day.
Thanks so much for informing me that this greenery can be eaten! I have pulled and tossed it from a landscaped bed on a warm winter day, but no more! I’m looking forward to a farmer’s sandwich now!
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Cardamine hirsuta(hairy bittercress). Photo by Saara Nafici.
Cardamine hirsuta’s toothpick-like seed capsules coil up tightly and then explode when touched, flinging the seeds far from the mother plant. Photo by Saara Nafici.
” > Show larger version of the image Hairy Bittercress Cardamine hirsuta’s toothpick-like seed capsules coil up tightly and then explode when touched, flinging the seeds far from the mother plant. Photo by Saara Nafici. Hairy Bittercress
Cardamine hirsuta (hairy bittercress) is shallow-rooted fairly easy to pull by hand. Photo by Saara Nafici.
” > Show larger version of the image Hairy Bittercress Cardamine hirsuta (hairy bittercress) is shallow-rooted fairly easy to pull by hand. Photo by Saara Nafici.
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This spring weed is known for its tasty leaves, but it’s most interesting feature may be the way it disperses seeds by flinging them through the air.
Worst Winter Weeds: Hairy Bittercress
Spring is in the air, little green things are popping up all over, and we all heave a sigh of relief that the blanket of white stuff is finally gone. But beneath the snow that stopped everything in its tracks lurks a hardy, robust little puff of tiny green leaves that virtually grows before your eyes.
(This article was originally published on March 29, 2010. Your comments are welcome but please be aware that authors of previously published articles may not be able to respond to your questions or comments.)
Call it what you will – hairy bittercress, winter bittercress, hairy cress, popping cress – Cardamine hirsuta – is a weed that tries the most forgiving gardener’s patience. Growing worldwide (except in the Antarctic, this genus of the Brassicaceae family numbers more than 150 species, both annual and perennial. The plant is self-pollinating and in bloom throughout the year. It loves moist soil and grows aggressively under those conditions.
As the snow melts, tiny white, pink, or lavender flowers begin to appear. Yes, flowers. This tenacious weed is short-lived, which is good, you say. A life cycle of 6 weeks doesn’t seem like such a big deal. Think again – how many 6-week cycles are there in a year?
One of the biggest problems with bittercress is that, by the time you discover you have a problem, it’s almost too late to do anything about it. The first flowers appear in late February or early March, quickly form seed pods, and mature. If you touch those trigger-happy seed pods, i t’s all over – the pods explode, distributing seeds over an area up to 36 inches around each plant. Those seeds will germinate and begin sprouting with a few days and the cycle begins again, only over a larger area. Small to medium size plants produce about 600 seeds, and larger plants can yield up to 1,000 seeds.
Hairy bittercress is not invasive enough to warrant using herbicides. As soon as new plants appear in February or March, begin pulling them; these are the offspring of the previous fall’s seed crop. Through the season, always pull the seedlings when you see them; they have shallow roots and come away quite easily; however, bits of root left behind are capable of re-rooting under optimum conditions. The key is to get the plants before they set seed, which happens quickly after blooming. Eradicating this weed from large areas is almost impossible, unless you can hoe and remove. Keeping bittercress out of the flower beds is a little easier, but requires diligent hand-weeding to stay ahead of the seed formation. The leaves release a pungent aroma when bruised.
Hairy bittercress is a problem in greenhouses and nurseries, so be sure to clear off the top 2 to 3 inches of soil before planting anything you purchase. Scoop the soil into a plastic bag and dis card. Keep a close watch on newly planted containers, especially those that are positioned near flower beds. The propulsion factor of bittercress seeds can sneak new plants into your containers while you aren’t looking. Hairy bittercress is a real problem near flagstone patios or walks, brick work, or any hard-scaping that has space between the pieces. This weed does not need much to set down roots – even a small amount of sand between two bricks is plenty.
As mentioned before, at least the seedlings are easy to pull.
Spring is in the air, little green things are popping up all over, and we all heave a sigh of relief that the blanket of white stuff is finally gone. But beneath the snow that stopped everything in…