Northern Virginia Weed Guide

Crabgrass is best stopped before it sprouts. Apply a pre-emergent in early spring once soil temps hit about 55°F — in Northern Virginia that's usually mid-March, right as the forsythia blooms. Once it's up, small plants can be spot-treated, but the real long-term fix is a thick fescue lawn that shades the soil so crabgrass seed never gets the light it needs to germinate.

Two windows matter most: a pre-emergent in early spring (mid-March) to block crabgrass and summer weeds, with a second application about 8 weeks later for extended control. For broadleaf weeds like dandelion and clover, fall is actually the most effective time to spray — the plants are pulling nutrients down to their roots and carry the herbicide with them.

Clover spreads where soil nitrogen is low, so two things work together: a selective broadleaf herbicide to knock down what's there, and a proper fall fertilization program so your grass — not the clover — wins the competition. Left unfed, a lawn will keep growing clover no matter how often you spray.

The usual offenders here are crabgrass, dandelion, clover, chickweed, henbit and purple deadnettle (the low purple-flowered weeds you see in early spring), wild violet, ground ivy (creeping Charlie), and nutsedge. Each needs a slightly different approach, which is why correct identification comes before any treatment.

Nutsedge looks like grass but is actually a sedge — it's lime-green, grows faster than your lawn, and has a triangular stem. Regular weed killers barely touch it, and pulling it usually makes it worse by scattering the underground tubers. It needs a sedge-specific herbicide, and because it loves wet ground, improving drainage keeps it from coming back.

Weeds colonize bare and thin turf — every open patch of soil is an invitation. Spraying alone treats the symptom. The lasting fix is a dense lawn: mow tall fescue at 3–4 inches, feed it in fall, and overseed thin areas in late summer so there's simply no room left for weeds to take hold.

Often, yes — certain weeds are telling you something. Clover and black medic point to low nitrogen, nutsedge and moss point to poor drainage or too much shade, and plantain and prostrate knotweed point to compacted soil. Correcting the underlying condition does more than any single herbicide application.

Yes. Selective herbicides target broadleaf weeds and sedges without killing tall fescue, and we spot-treat rather than blanket-spray wherever possible. Paired with correct timing and a healthy, well-fed lawn, this clears weeds while keeping your grass thick and green.