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Home > Weeds > Quackgrass

Quackgrass—Elymus repens, Elytrigia repens

A creeping perennial grass, quackgrass spreads extensively through rhizomes (horizontal underground stems). It is an aggressive invader in crops, pastures, lawns, roadsides, and disturbed areas.

quackgrass infestation quackgrass flower quackgrass diagram
Leaves are long, flat and tapered, and slightly hairy on the upper surface. Seeds grow on long, narrow spiked seed heads which are 3 to 8 inches long and appear in July. Stems are smooth and hollow and grow 1 to 4 feet tall.


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[Photos, left to right: Steve Dewey, Utah State University,; Robert Vidéki, Doronicum Kft.,; USDA PLANTS Database, USDA NRCS PLANTS Database,]

It is the policy of the State of Maine to minimize reliance on pesticides. The Maine Department of Agriculture and the Maine IPM Council encourage everyone to practice integrated pest management and to use pesticides only as a last resort. The mention of pesticides in the fact sheets linked to these pages does not imply an endorsement of any product. Be sure that any product used is currently registered and follow all label directions.