Controlling Nimblewill in Illinois Lawns

A Peoria, IL homeowner battles nimblewill (Muhlenbergia schreberi) — a warm-season perennial grass that invades cool-season lawns.

Effective Strategy

• Glyphosate (Roundup) application while actively growing — superior to mechanical removal because nimblewill regenerates from rhizome fragments
• Soil solarization (clear plastic during hot weeks) as non-chemical alternative
• Reseed after confirmed kill — fall seeding still viable for cool-season grasses

Cultural Suppression

Nimblewill grows late spring to early fall. Fertilize, aerate, and overseed cool-season grasses in fall and spring to favor them during nimblewill's dormancy.