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Quackgrass (Agropyron repens) is a perennial grass that spreads by seeds and rhizomes. Seed heads are 2- to 7-inch long spikes. Leaves are 4 to 8 inches long and about ¾ inch wide. Narrow projections (auricles) from leaf blades encircle stems. Quackgrass tolerates mowing and usually remains green even when dormant. 

Quackgrass growth habit.

(Photo: Ohio State Weed Laboratory, The Ohio State University, Bugwood.org)

Close-up of auricle.

(Photo: Steve Dewey, Utah State University, Bugwood.org)

Management:

• Avoid cultivation, which spreads rhizomes.
• Chemical control is difficult because rhizome buds may remain dormant, therefore, unaffected by systemic herbicides. Repeat applications are often necessary.

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