Weeds With White Flowers in Lawns: 10 Common Types and How to Identify Them

You’re raking the last leaves and there it is: a low, bright-green mat creeping out from the flower bed. Or it’s spring, and the lawn has broken out in little white balls, stars and flowers on grassy stalks. Before you buy anything, you want to know which weeds with white flowers you’re looking at.

Short answer: the weeds with white flowers you are most likely to find in a lawn are white clover, common chickweed, mouse-ear chickweed, hairy bittercress, shepherd’s purse, Virginia buttonweed, wild onion, star-of-Bethlehem, English daisy and yarrow. To tell them apart quickly, count the petals, then look at the leaves. Three of the ten are winter annuals that die on their own by early summer, so they need a different plan from the perennials and bulbs on this list.

White is the most common flower colour among lawn weeds, which is why white blooms are so hard to name from a distance. Get down to grass level and check three things:

• how many petals each flower has
• whether the leaves are paired, lobed or grass-like
• whether the plant grows from a rosette, a creeping stem or a bulb

By the end, you’ll be able to name your weed, know whether it dies on its own or comes back, and pick the right month to act. Reading this in autumn? Good timing: nine of the ten have fall in their treatment window. Only Virginia buttonweed waits for spring.

If your weed has coloured flowers instead, see our guides to weeds with yellow flowers, weeds with purple flowers and lawn weeds with blue flowers, or browse the full lawn weeds section.

Quick identification chart for weeds with white flowers

Find the row that matches what you see, then jump to that weed’s section. If two rows look alike, the last-but-one column breaks the tie.

Count the petals: the fastest way to identify white-flowered lawn weeds

Here’s the trick: mowing changes a weed’s height and flower size, but never its petal count. That makes petals a more reliable clue than size or stem height. If the flowers are tiny, zoom in with a hand lens or your phone camera.

• Four petals: hairy bittercress, shepherd’s purse (both mustard family) and Virginia buttonweed.
• Five petals, each split almost to the base: common chickweed and mouse-ear chickweed. At a glance they look like ten petals.
• Six petals (tepals): wild onion, wild garlic and star-of-Bethlehem, which all grow from bulbs.
• Many petals around a yellow centre: English daisy.
• No obvious petals, just a ball or a flat plate of tiny florets: white clover (ball) and yarrow (flat plate).

Clover heads: white clover

1. White clover (Trifolium repens)

Almost everyone recognises this one, but look closely before you act. White clover has three oval leaflets, each ¼ to ¾ inch across, usually marked with a white or pale green inverted V. The stems creep along the soil surface and root at the nodes, which is why white clover forms patches instead of single plants. Penn State Extension describes the flower heads as globe-shaped, ½ to ¾ inch across and made up of 20 to 40 small white flowers, peaking in late spring and early summer.

Why does clover win? It’s a legume, so bacteria in its root nodules supply it with nitrogen. In an under-fertilised lawn, the grass is starved but the clover isn’t. That’s why Penn State recommends nitrogen fertilisation and a denser turf as the first step.

For herbicides, Penn State lists dicamba, clopyralid, fluroxypyr and quinclorac, usually in combination products, and notes that fall applications are often the most effective. Follow the label.

First, ask whether you want it gone. Many homeowners now keep some clover on purpose, because its flowers feed bees and it supplies its own nitrogen. If you do spray, mow first to remove the flowers, so bees aren’t foraging in the treated area. Black medic and hop clover look similar but have yellow flowers; see our yellow-flowered weeds guide to tell them apart.

Five split petals: the chickweeds

Two chickweeds turn up in lawns, with almost identical flowers. But one is a winter annual and the other a perennial, and that difference decides whether a pre-emergent helps you or wastes your money.

2. Common chickweed (Stellaria media)

Common chickweed has smooth, light green, oval leaves that come to a point, arranged in pairs along weak, sprawling stems. The small white flowers have five petals, each split so deeply that the flower looks as if it has ten.

Soft green carpet in a shady corner this autumn? Likely this one. Purdue University’s turf program classes it as a winter annual that germinates in late summer or early fall and does best in shade and on compacted, moist or poorly drained soil.

Purdue’s control options split neatly by timing and grass type:

• Prevention: isoxaben, pendimethalin, prodiamine and dithiopyr, applied before chickweed germinates in autumn.
• Emerged plants, cool-season lawns: combinations of 2,4-D, dicamba, MCPP or MCPA.
• Emerged plants, warm-season lawns: metsulfuron, flazasulfuron and Celsius (thiencarbazone, iodosulfuron and dicamba).

Fair warning: Purdue notes most need a second application, especially in spring when plants are larger. Small autumn seedlings are the easier target.

3. Mouse-ear chickweed (Cerastium fontanum)

Mouse-ear chickweed has dark green, oblong leaves covered in hairs on the upper surface, which is where the “mouse ear” name comes from. Its flowers have the same five deeply split white petals as common chickweed, with hairy sepals almost as long as the petals. Purdue notes two differences that matter for control: mouse-ear chickweed usually behaves as a perennial, and its stems root wherever the nodes touch soil, so it spreads into dense mats.

Here’s where people trip up: because it’s a perennial, pre-emergents do little against an established patch, which never needs to germinate again. Purdue recommends post-emergent two-way or three-way products (2,4-D, dicamba, MCPP or MCPA), repeated as needed.

Four petals: bittercress, shepherd’s purse and Virginia buttonweed

Four petals put you in one of two camps: easy-going mustard-family winter annuals, or a stubborn southern perennial that can take two years to beat. Leaves and seed pods tell you which.

4. Hairy bittercress (Cardamine hirsuta)

Hairy bittercress starts as a flat rosette of compound leaves with small, rounded leaflets. In early spring it sends up thin stems topped with tiny four-petalled white flowers, followed by narrow pods ¾ to 1 inch long.

Brush a ripe plant and you’ll see how it got into your lawn. Penn State Extension explains that the ripe pods split open abruptly and launch seeds up to several feet, which is how it spreads so quickly from flower beds into lawns.

Timing is the problem: bittercress usually sets seed before most people apply spring weed killers. Penn State’s advice:

• apply a pre-emergent in late summer or early fall, before the seedlings appear
• mow frequently in early spring to remove flower stems

Missed the fall window? Spring mowing is your fallback. Remember that pre-emergent herbicides also stop grass seed from germinating, so don’t use one where you plan to overseed this fall.

5. Shepherd’s purse (Capsella bursa-pastoris)

Shepherd’s purse also forms a rosette, but its leaves are usually toothed or lobed, a bit like a small dandelion. Upright stems carry small four-petalled white flowers that open from the bottom up.

Look lower down the stem. The identifying feature is the seed pod: Washington State University’s HortSense describes heart-shaped to triangular pods on stalks about ½ inch long, so a single stem shows buds at the top and ripening “purses” further down.

Good news: it’s an annual or winter annual with a thin taproot, so hand-pulling or hoeing works well. Honestly, for a handful of plants, that’s all it takes. In lawns, WSU lists 2,4-D, MCPA, MCPP and triclopyr products. A dense lawn is the best long-term defence, because the seedlings need open soil to establish.

6. Virginia buttonweed (Diodia virginiana)

In the South, and nothing you spray sticks? This may be why. Virginia buttonweed is the toughest weed on this list, mainly in warm-season lawns in the southern United States.

It has paired, dark green, lance-shaped leaves with no leaf stalks and white tubular flowers with four petals arranged in a star. Clemson University’s Home & Garden Information Center notes that by late summer the leaves often turn yellow-green because of a virus.

It has three ways to spread:

• underground stems
• seed from flowers both above and below ground
• stem pieces that mowers and string trimmers scatter and that root in moist soil

That’s also why hand-pulling fails: root and stem pieces left behind sprout again. It thrives in poorly drained or overwatered lawns, so watering deeply but infrequently and core aerating are part of the fix.

Clemson suggests metsulfuron or Celsius WG at spring green-up, repeated 4 to 6 weeks later. In bermudagrass and zoysiagrass, three-way herbicides can be used after full green-up, but not when temperatures are above 90°F. Follow the label, and expect to treat for two years.

Six petals from a bulb: wild onion and star-of-Bethlehem

Bulb weeds are the sneaky ones: they look like grass for most of the year, so they often go unnoticed until they flower. New grassy shoots this late in the year? Fall is when wild onion and wild garlic emerge. For more grass-like lawn weeds, see weeds that look like grass.

7. Wild onion and wild garlic (Allium canadense and Allium vineale)

Both plants grow from bulbs, rise above the grass within days of mowing and smell of onion when crushed. One squeeze separates them. Clemson HGIC explains: wild garlic leaves are round and hollow, while wild onion leaves are flat and solid.

Wild onion carries dome-shaped clusters of star-shaped white or pink flowers from May to July (Lady Bird Johnson Wildflower Center, University of Texas). Wild garlic flowers are greenish pink to purplish (NC State TurfFiles).

Both emerge in late fall, grow through winter and spring, form small aerial bulbs in late spring and die back in early summer. Their underground bulbs can survive in the soil for several years, so one season rarely finishes the job.

Pulling usually snaps the leaves and leaves the bulb behind, so dig clumps out with a thin trowel when the soil is moist.

Clemson recommends spraying in fall after new shoots appear and again in early spring (February to early March) for two years. Iowa State University lists 2,4-D, MCPP and dicamba products, plus metsulfuron, sulfentrazone and sulfosulfuron.

Iowa State adds that mowing just before spraying helps, because herbicides work better on freshly cut leaves. Follow the label for rates and timing.

8. Star-of-Bethlehem (Ornithogalum umbellatum)

Star-of-Bethlehem looks like wild onion until you crush a leaf: it has no onion smell. The leaves are narrow, smooth and fleshy with a whitish groove down the midrib. From April to June it produces bright white six-petalled flowers with a green stripe on the underside of each petal. University of Illinois Extension warns that all parts of the plant are poisonous if eaten, which matters in lawns used by children and pets.

It’s also hard to kill. Illinois suggests sulfentrazone, carfentrazone or 2,4-D (ester formulations work better than amines), applied in spring once temperatures reach at least 50°F and again in fall, for at least two years.

A field study in dormant bermudagrass found that halosulfuron, imazaquin, metsulfuron, a three-way mix and triclopyr plus clopyralid gave 35% control at most. Bromoxynil, alone or in mixes, gave at least 80% control 35 days after treatment (Main and colleagues, Weed Technology, 2004).

If you dig the bulbs out of a bed, bag them. Don’t compost them or till the area, because both spread the bulbs. Our guide to disposing of invasive plants explains safe options.

Daisy-type flowers: English daisy and yarrow

These are the prettiest weeds on the list, which is the problem: they’re often left alone until they form mats. Both are perennials, easiest to manage while patches are small.

9. English daisy (Bellis perennis)

English daisy, also called lawn daisy, is common in cool, moist climates such as the Pacific Northwest and much of Europe. It grows as a flat rosette of spoon-shaped leaves on long stalks, with no leafy upright stem.

Each flower stalk carries a single daisy head with white (sometimes pink or red) petals around a yellow centre. WSU HortSense notes that it spreads from the crown into clumps as well as by seed.

Digging works on a few plants, but there’s a catch: disturbing the soil can bring buried seeds to the surface. In turf, WSU recommends triclopyr products and warns that several applications are usually needed, so check the label for repeat intervals.

10. Yarrow (Achillea millefolium)

In a mown lawn you may never see yarrow flower, so go by its leaves: soft, feathery and finely divided, and strongly scented when crushed. In taller grass it produces flat-topped clusters of tiny white flower heads. Under the mower, it spreads by underground stems and forms a thick mat. University of Maryland Extension says it is a sign of dry, under-fertilised soil.

Pull or dig small patches early, when the soil is moist. For larger patches, Maryland lists selective broadleaf herbicides containing 2,4-D, MCPP, dicamba or triclopyr.

Easy to miss: Maryland warns against using dicamba over the root zones of trees and shrubs, because roots can take it up. Researchers have also tested yarrow as a low-input lawn plant for dry Mediterranean climates (Urban Forestry & Urban Greening, 2022), so decide first whether a few patches are really a problem.

When to treat weeds with white flowers

The costliest mistake is spraying at the wrong point in a weed’s life. The life cycle matters more than the flower, so group your weeds before choosing a product or date.

• Winter annuals (common chickweed, hairy bittercress, shepherd’s purse): they germinate in late summer and fall and die by early summer. Apply a pre-emergent in late summer to early fall, or spray small seedlings in autumn. Spraying plants that are already flowering in late spring does little, because they are about to set seed and die anyway. Our article do weeds die in winter? explains the full cycle.
• Creeping perennials (white clover, mouse-ear chickweed, English daisy, yarrow, Virginia buttonweed): fall is usually the best window in cool-season lawns, with a second application a few weeks later. Virginia buttonweed is the exception and is treated from spring green-up in warm-season lawns.
• Bulbs (wild onion, wild garlic, star-of-Bethlehem): spray in fall and again in early spring, and plan on two seasons. Mowing just before you spray helps the herbicide get in.

Always read and follow the product label, and check that it lists both your weed and your grass type. Some of the active ingredients named above, such as metsulfuron and flazasulfuron, are listed by Purdue for warm-season turf only and are not meant for most cool-season lawns.

Late autumn? Seedlings are small, wild onion is emerging, and perennials are moving reserves into their roots, carrying systemic herbicide with them. Once growth stops, the window closes until early spring, so check the label’s temperature range.

A note from the agronomist’s side

Think of weeds with white flowers as a soil report written in plants. Each one shows up where conditions suit it better than your grass:

• Clover and yarrow point to low nitrogen or dry, thin turf.
• Chickweed and Virginia buttonweed point to shade, compaction or too much water.
• Bittercress and shepherd’s purse point to bare soil in autumn, when their seeds germinate.

Herbicides treat the symptom. A core weed-science rule: a crop that covers the ground early and completely leaves weeds nowhere to start, and a lawn is just a crop of grass. Spray without changing anything, and the same conditions hand the patch back.

So, first fix the fertiliser, watering or mowing height that let the weed in. Then time any spray to the life cycle, following the label. Do both, and the same patch is far less likely to return next year.

Frequently asked questions

What is the weed with tiny white flowers in my lawn?

In early spring, tiny white flowers on a low, sprawling plant are usually common chickweed or mouse-ear chickweed (five split petals) or hairy bittercress (four petals, thin upright pods). Check the leaves: smooth and light green means common chickweed, and hairy and dark green means mouse-ear chickweed.

What weed looks like grass but has white flowers?

Star-of-Bethlehem and wild onion. Crush a leaf: wild onion smells of onion, and star-of-Bethlehem has no smell and a white stripe down the middle of each leaf.

Is white clover bad for a lawn?

Not necessarily. White clover fixes its own nitrogen and its flowers feed bees. It becomes a problem when you want a uniform grass lawn, or when bees in the flowers are a risk for someone allergic to stings. If you want it gone, a fall herbicide application and better fertilisation work best.

Related guides: Clover in Lawn: Should You Keep It or Kill It? · Weeds With Purple Flowers in Lawns: 8 Common Ones and How to Identify Them · Weeds With Yellow Flowers in Lawns: 8 Common Ones and How to Identify Them · Bindweed vs Morning Glory: How to Tell Them Apart

Sources

• Penn State Extension, White Clover and Hairy Bittercress
• Purdue University Turfgrass Science, Common Chickweed and Mouse-ear Chickweed
• Washington State University HortSense, Shepherd’s-purse and English Daisy
• Clemson Home & Garden Information Center, Virginia Buttonweed and Wild Garlic & Wild Onion
• NC State TurfFiles, Wild Garlic
• Iowa State University Extension, How do I control onion grass in my lawn?
• Lady Bird Johnson Wildflower Center, Allium canadense
• University of Illinois Extension, Controlling Star-of-Bethlehem
• Main, C.L., Robinson, D.K., Teuton, T.C. and Mueller, T.C. (2004). Star-of-Bethlehem control with postemergence herbicides in dormant bermudagrass turf. Weed Technology 18(4).
• University of Maryland Extension, Yarrow
• Yarrow (Achillea millefolium) for low-input lawns in the Mediterranean environment. Urban Forestry & Urban Greening (2022).