What is common chickweed?

Common chickweed is a low, sprawling winter annual that shows up in lawns, garden beds and mulched areas all over Pennsylvania. Good common chickweed identification is useful because it looks a lot like its tougher cousin, mouse-ear chickweed, and the two behave a bit differently.

It sprouts in late summer and fall, stays green right through the winter (often under snow), then grows fast in early spring while your lawn is still waking up. By June most of it has set seed and faded in the heat.

On the bright side, it’s shallow-rooted, easy to pull and even edible. It’s usually a sign of thin, shady or damp turf more than a serious threat.

Common chickweed identification: what to look for

Get close to a patch on a cool spring morning and check these features:

• Leaves: small, smooth, bright green and egg-shaped with a pointed tip, set in opposite pairs along the stem. Lower leaves have short stalks; upper ones sit right on the stem.
• Stems: thin, weak and trailing. Look closely and you’ll see a single line of fine hairs running down one side, switching sides at each joint. That line is the classic tell.
• Flowers: tiny white stars at the stem tips, a quarter inch across or less. Each has five petals split so deeply they look like ten, with green sepals about as long as the petals.
• Roots: shallow and stringy, so the whole plant lifts out with a gentle pull.

It forms loose, lush mats rather than a tight rosette, and it feels soft and smooth, not fuzzy.

Where it grows in Pennsylvania

Common chickweed likes cool weather, moisture and some shade. In central PA yards you’ll find it on the north side of the house, under trees and shrubs, along foundations, in fresh mulch and in thin lawns that stay damp through spring.

Garden beds and vegetable plots that sit bare over winter are prime real estate. It also shows up in newly seeded lawns in fall, where it can get a head start before the grass fills in. Clay soils that stay wet through spring freeze-thaw cycles suit it well.

Common chickweed look-alikes

A few low spring weeds get mixed up with common chickweed:

• Mouse-ear chickweed is the big one. Its leaves are darker and covered in fuzzy hairs, like a mouse’s ear, and it’s a perennial whose stems root at the joints. Common chickweed’s leaves are smooth, with just that single line of hairs on the stem.
• Speedwells such as corn speedwell and ivyleaf speedwell are also low spring weeds, but they have tiny blue flowers with four petals and toothed or lobed leaves.
• Henbit and purple deadnettle have square stems and pink-purple tubular flowers.
• Catchweed bedstraw has narrow leaves in whorls and clingy, bristly stems that stick to clothing.

How to get rid of common chickweed

Hand and mechanical. This is one weed where pulling it yourself is often the right answer. In beds and small lawn patches, grab a handful and lift; the shallow roots come right out. Rake out loose mats in lawns before they flower. Get it before it sets seed in spring and you’ll see far less next year. Toss flowering plants in the trash or a hot compost pile, since seeds can ripen even after you pull them.

Cultural. Chickweed thrives where turf is thin. Mow at 3 to 3.5 inches, fertilize mainly in fall, and overseed bare or thin spots in late summer so grass fills in before the chickweed sprouts. In shady spots, choose shade-tolerant fine fescues. Improving drainage on wet ground and cutting back on frequent light watering helps too. In beds, keep 2 to 3 inches of mulch over bare soil.

Chemical. On larger lawn infestations, extension services list postemergence broadleaf herbicides containing dicamba, MCPP (mecoprop) and/or fluroxypyr, often in combination products, as effective. The best time is fall, when young plants are actively growing, or early spring before flowering. Waiting until late spring wastes product because the plants are already dying back. Some lawn preemergence herbicides are labeled for chickweed when applied in late summer before seeds sprout, but they also stop grass seed, so don’t use them where you plan to overseed.

Always read and follow the product label, because the label is the law, and confirm it’s labeled for your site, whether that’s a lawn, a flower bed or a vegetable garden. Applying herbicide for hire in Pennsylvania requires a PA Department of Agriculture pesticide applicator certification, so whole-lawn programs belong with a licensed lawn-care company.

Keeping it from coming back

Chickweed keeps coming back from seed in the soil, so the long-term fix is giving it nowhere to sprout. A thick, healthy lawn going into fall is your best defense, and late-summer overseeding is the single most useful step.

In beds, top up mulch every year and avoid leaving soil bare over winter. Edge beds cleanly so lawn weeds don’t creep in. If chickweed keeps coming up in a soggy low spot, the real problem may be drainage; fixing standing water takes away the damp conditions it loves.

Questions we get about common chickweed

Similar weeds

Mouse-ear ChickweedCerastium fontanumHenbitLamium amplexicaulePurple DeadnettleLamium purpureum