Weed Control
Virginia Buttonweed: Identification and Control
Quick answer
Virginia buttonweed is a perennial of wet, poorly drained turf that regrows from root and stem fragments and sets seed underground as well as above it. Control means repeat herbicide applications through the season, over more than one year, plus fixing the drainage.
Virginia buttonweed has a reputation as one of the hardest weeds in southern lawns, and it earns it. It is a perennial with a deep taproot, it regenerates from root and stem fragments, and it produces seed both from its visible white flowers and from flowers below the soil surface. That underground seed is the detail that defeats most control programs, because it is untouched by anything you spray.
It is also a drainage indicator. Buttonweed concentrates in low spots, poorly drained ground and lawns that are watered too often. Check your irrigation with the sprinkler zone calculator before committing to a spray program.
On this page
How do I identify Virginia buttonweed?
| Trait | Virginia buttonweed |
|---|---|
| Weed type | Broadleaf |
| Life cycle | Perennial; taproot and root fragments survive winter |
| Season | Warm season; grows spring through fall, strongest in summer |
| How it spreads | Root and stem fragments, plus seed produced both above ground and from underground flowers |
| Leaf | Opposite, lance-shaped to elliptical, joined across the stem by a thin membrane at each node |
| Stem | Fleshy, branched and spreading flat across the ground, rooting where nodes touch soil |
| Flower | Small white star-shaped flowers with four petals, in the leaf joints |
| Roots | Deep taproot with lateral roots that resprout from pieces left in the soil |
| What it says about the lawn | Wet soil, poor drainage, overwatering, low spots and compacted ground |
Mowing spreads it. Stem fragments cut by the mower root where they land, which is one reason a patch expands along mowing lines.
Why is Virginia buttonweed so hard to kill?
It defends itself four ways. The taproot survives foliar treatments that kill the visible plant. Root and stem fragments regenerate, so mechanical removal and even mowing spread it. Underground flowers set seed that no spray reaches. And the wet conditions it prefers are usually a site problem rather than a maintenance one.
That combination means a single application, however well chosen, will not finish it. Realistic programs use repeat applications through the growing season, commonly at intervals of a few weeks as the label allows, continued across more than one year. Progress looks like shrinking patches rather than a clean kill.
Fix the water first where you can. Repair the leaking head, shorten the overlong zone, and drain or regrade the low corner. Watering methods are compared in drip irrigation vs sprinklers, and opening compacted wet ground is covered in how to aerate a lawn. Without that, you are treating a symptom on a schedule the site keeps resetting.
How do I get rid of Virginia buttonweed?
Treat this as a multi-year program with a drainage component, and choose products by their turf list, since southern lawn chemistry varies sharply by grass species.
| Method | When | What it involves |
|---|---|---|
| Fix drainage and irrigation | Before or alongside treatment | Repair leaking heads, shorten zones, regrade low spots. The condition that favors buttonweed over turf. |
| Repeat broadleaf applications | Through the growing season, per label interval | Commonly several applications a season. Single treatments regrow from the taproot. |
| Continue across seasons | More than one year | Underground seed and surviving roots mean multi-year programs are the norm. |
| Products for southern turf | Per label and turf species | Some southern lawn products list buttonweed. Atrazine is used on certain St. Augustine and centipede lawns, and is restricted in some states. |
| Metsulfuron-containing products | Per label, professional guidance | Named in extension guidance for buttonweed but with strict turf restrictions and injury risk on the wrong grass. Read the label closely. |
| Avoid spreading fragments | Every mowing | Cut stems root where they land. Bag clippings in infested areas and clean the mower before moving to clean turf. |
| Thicken the turf | Growing season | Dense healthy turf slows spread, though it does not remove an established stand. |
Be sceptical of any claim of one-application control on this weed. Extension guidance consistently describes repeat treatments over multiple seasons.
Which products apply to buttonweed?
Start with broadleaf concentrates and repeat them: Ortho WeedClear Weed Killer for Lawns Concentrate, 1 gal covers up to 64,000 sq ft but excludes Floratam St. Augustine, and Spectracide Large Plot Weed Stop for Lawns Concentrate, 1 gal treats 42,500 sq ft of southern grass. On St. Augustine and centipede lawns, atrazine is the southern-lawn option used against a range of weeds, and it is restricted in some states, never appropriate for northern lawns.
Products containing metsulfuron appear in extension guidance for buttonweed, but they carry tight turf restrictions and can seriously injure the wrong grass species, so match the label to your lawn before buying. Roundup Weed and Grass Killer4 Concentrate, 1 gal kills buttonweed and the turf together, which makes it a renovation tool rather than a spot treatment. For the wet-soil cause, The Andersons NutraSoft OP Pelletized Gypsum, 40 lb is a pH-neutral gypsum the maker says loosens hard clay across 6,600 sq ft.
What gear helps with buttonweed?
A sprayer you will use many times, irrigation control to stop the overwatering, and aeration for the compacted wet ground. Controller options are in the best smart sprinkler controllers.
Smith Performance Sprayers R200 2-Gallon Compression Sprayer
$55.97A pro-grade 2 gallon compression sprayer with Viton seals and tool-free pump seal changes, suited to a program of repeat treatments over years.
Best for: multi-season spraying
Check price on Amazon
Rachio 3 Smart Sprinkler Controller, 8 Zone
$199.00An 8 zone smart controller that skips runs for rain, wind and freeze, addressing the saturated soil buttonweed depends on.
Best for: replacing a dial timer on an existing system
Check price on Amazon
Yard Butler ID-6C Manual Lawn Coring Aerator
$48.95A step-on coring tool pulling two plugs per push, useful for improving water movement in the soggy low areas where buttonweed sits.
Best for: spot aeration of wet patches
Check price on AmazonHow we chose
We did not test these products in person. Picks are researched from manufacturer specifications and owner manuals, engine and safety certifications where they apply, warranty terms, public recall records, and the recurring themes in verified owner reviews. We favor established brands with large review counts and parts support, match each pick to a real yard size or task, and place it in the tier where its price and capability actually belong.
Frequently asked questions
Why does Virginia buttonweed keep coming back?
Because most of the plant survives a foliar application. It regrows from a deep taproot and from root and stem fragments left in the soil, and it produces seed from underground flowers that no spray reaches. Mowing spreads cut stems that root where they land. Control requires repeat applications through the season, continued across more than one year, plus fixing the wet soil.
Does buttonweed mean my lawn is too wet?
Usually. Virginia buttonweed concentrates in low spots, poorly drained ground and lawns watered too frequently, because it tolerates saturated soil better than turf does. A patch that sits in one corner while the rest of the lawn is clean is a drainage map. Repairing leaking heads, shortening irrigation zones and regrading low areas addresses the cause rather than the symptom.
Can I pull Virginia buttonweed out?
Not effectively. The deep taproot usually breaks, and both root and stem fragments left behind regenerate into new plants, so hand removal commonly multiplies a patch. Even mowing spreads it, because cut stems root where they land. For that reason, bag clippings in infested areas, clean the mower before moving to clean turf, and rely on a repeat herbicide program instead.
Researched, not professional advice. This page is compiled from published specifications, manuals, labels and owner-review consensus, not hands-on testing. Follow the manufacturer's instructions and product label, and consult a qualified professional where safety, chemicals, fuel or structures are involved. As an Amazon Associate we earn from qualifying purchases.