Nimblewill
Grassy weed
Nimblewill (Muhlenbergia schreberi) is a wiry, warm-season perennial grass native to North America that turns up as an unwelcome invader in cool-season lawns and shaded landscape beds. Gardeners and turf managers notice it most in fall and winter, when its dormant patches fade to a pale straw color while the surrounding lawn stays green.
How to identify it
Nimblewill has thin, flat, gray-green leaf blades about 1 to 2 inches long that stand out at right angles along slender, branching stems. It grows low and sprawling, spreading by above-ground runners (stolons) that creep along the soil surface and root at the nodes to form loose, matted patches. The stems are delicate and wiry, and plants generally reach only a few inches tall in mowed turf but can grow taller when left uncut. In late summer it sends up thin, spike-like seed heads, and the shallow, fibrous roots make established patches easy to see but stubborn to remove cleanly.
Where it grows
It thrives in lawns, garden beds, along walkways, and in disturbed or neglected ground, and it favors moist soil and partial to full shade where turfgrasses grow thin. As a warm-season grass it greens up late in spring, grows through the heat of summer, and goes dormant with the first hard frost, leaving tan patches through the cold months. Nimblewill spreads both by seed and by creeping stolons, and even small stem fragments left behind can take root and start new patches.
Why it is a problem
Because it spreads by rooting runners, nimblewill forms expanding patches that crowd out desirable turfgrass and compete for water, light, and nutrients. Its off-season dormancy leaves conspicuous dead-looking spots in an otherwise green lawn, which many homeowners find unsightly. Once established it is difficult to pull out completely, and any missed stem pieces readily regrow, so infestations tend to enlarge year after year.
How to manage it
The best defense is a dense, vigorous lawn, so mow at the taller end of the recommended height for your turf, water deeply but infrequently, and keep soil fertility and drainage in good shape to shade out new seedlings. For small patches, dig or hand pull the plants when soil is moist and remove all the stolons and roots, since fragments left behind will resprout. A layer of mulch in garden beds and prompt reseeding or plugging of thin, bare, or shaded areas help close the gaps where nimblewill takes hold. Repeated removal over a season or two, combined with improving the shade and moisture conditions it favors, gives the most lasting non-chemical control.
Commonly confused with
Nimblewill is most often confused with bermudagrass, which also spreads by stolons but has a coarser texture and a more rooted, aggressive growth habit; it can also be mistaken for creeping bentgrass in shaded, moist turf. A useful clue is the timing of dormancy, since nimblewill browns out sharply after frost and greens up late in spring.
General guidance for US lawns and gardens, focused on prevention and non-chemical control. For a confirmed identification and options specific to your area, contact your local Cooperative Extension office. Page updated Aug 4, 2026.