The Most Common Lawn Weeds in Wisconsin (and How to Control Them)

Most lawn weeds are opportunists — they move into thin, stressed, or bare spots where the grass is not dense enough to crowd them out. That is why the best long-term weed control is a healthy, well-fed lawn. The treatments below handle what is already there; good fertility and mowing keep it from coming back.

A fast-spreading annual grassy weed that sprouts from seed each spring and dies off in fall, leaving bare patches behind. The key is prevention: a properly timed pre-emergent stops it before it germinates. Once it is up, it has to be treated as a post-emergent problem.

The familiar, yellow-flowered perennial with a deep taproot. Because of that taproot, pulling rarely works for long; targeted broadleaf herbicide during active growth in spring or fall is the reliable route.

A low, creeping perennial with three-part leaves and white flowers that bees love. It often signals lower nitrogen, so consistent feeding plus targeted broadleaf control keeps it in check.

A persistent, vining perennial with scalloped leaves and a minty smell that thrives in shade and damp areas. It is one of the tougher weeds to control and usually takes well-timed broadleaf treatments, often in fall, plus improving the conditions that favor it.

Broadleaf plantain forms rosettes in compacted soil and responds to broadleaf herbicide. Nutsedge is a grass-like sedge that grows faster than the lawn in summer and needs a specific sedge-targeted product — standard weed control will not touch it.

Knowing which weed you have — and whether it is annual or perennial — determines the timing and the product. A treatment program takes that guesswork off your plate by matching the right control to the right weed at the right time of year.