Plant Problem Diagnostic
Creeping Bentgrass in Lawns: ID and What to Do About the Patches
The short answer
Those distinct patches of extra-fine, pale grass are most likely creeping bentgrass. K-State describes it as an extremely fine-textured, low, spreading cool-season grass with blue-green to dull gray, pointed leaves that forms dense, irregular circular patches which break up the lawn's uniformity. At normal lawn height it grows puffy and is prone to being scalped by the mower, which is a giveaway.
It spreads mainly by lateral creeping stems called stolons, and it commonly gets into lawns as a contaminant in Kentucky bluegrass seed lots because its seed is so small; mowers can also drag stolons from patch to patch. Its low, mat-forming habit is incompatible with upright turfgrasses, so it stands out rather than blending in, and it is more prone to diseases like dollar spot and brown patch.
Because it will not integrate with the rest of the lawn, control means removing or killing whole patches rather than tolerating them. For a few patches, digging them out completely (every stolon) and reseeding works; larger infestations are usually spot-treated with a non-selective herbicide, typically needing two or more applications because hidden stolons regrow.
How to identify it
Look for texture and color first. Creeping bentgrass is much finer than typical lawn grass, prostrate and spreading, with blue-green to grayish, pointed leaves, and it forms dense, irregular, roughly circular patches that disrupt the lawn's even look. Because it grows in a low mat, at lawn-mowing height it puffs up and the mower tends to scalp it, leaving thin, off-color spots.
It is easy to confuse with other patchy grassy invaders. Unlike coarse quackgrass or upright nimblewill, bentgrass is notably fine and dense; if the patch is very fine, spongy, and light-colored and scalps when mowed, bentgrass is the likely answer. When in doubt, your county Extension office can confirm the ID.
Why it is in your lawn
Creeping bentgrass is bred for golf greens, not home lawns, so its presence is almost always accidental. K-State notes it is a common contaminant in Kentucky bluegrass seed lots because of its tiny seed size, which is the most frequent way it invades; transfer of stolons on mowing equipment is another route. Once established, its stolons let a single patch expand outward year after year.
Conditions matter too: close, frequent mowing and frequent light watering favor bentgrass over deeper-rooted lawn grasses, so mowing higher and watering less often (deeply and infrequently) tips the advantage back toward your desired turf.
Getting rid of it
- Few patches: physically remove them with a shovel or sod cutter, taking the entire plant including stray stolons, then reseed or sod with your lawn grass (K-State).
- Larger areas: spot-treat with a non-selective systemic herbicide; expect two or more applications because stolons below the canopy escape the first and regrow (K-State).
- Solarization is an option: clear plastic fixed over a patch for about five to seven days can smother and heat-kill the turf beneath before you reseed.
- Discourage regrowth by mowing higher and watering deeply but infrequently, which favors deeper-rooted lawn grasses over shallow bentgrass.
- Any herbicide here is non-selective and will kill desirable grass too; follow the label and Extension guidance, then reseed the bare area.
→ Removing a patch leaves bare ground that weeds will colonize, so reseed or sod promptly. Spring or fall reseeding aligns with the cool-season seeding window.
Sources
Reviewed 2026-07-18. We cite university Extension, government, and established horticultural sources — and never invent pesticide rates or dangerous treatments.
- Kansas State University Turf - Creeping Bentgrass — Creeping bentgrass is an extremely fine-textured, prostrate, spreading cool-season grass with blue-green to dull gray pointed leaves that forms dense irregular circular patches, grows puffy and prone to mower scalping, spreads by stolons, is a common contaminant in Kentucky bluegrass seed lots, and is incompatible with upright turfgrasses; control few patches by physical removal with a shovel or sod cutter (including stray stolons) then reseed, spot-treat larger areas with a non-selective systemic herbicide (usually two or more applications), or solarize with clear plastic for five to seven days.
- UC IPM - Healthy Lawns: Creeping bentgrass management tips — Creeping bentgrass is a fine-textured, stoloniferous cool-season grass considered a weed when it invades other turf; close mowing and frequent watering favor it, while removal of patches and reseeding with the desired species is needed to control it.