Elymus repens


    Quackgrass (Matt Lavin, Wikimedia Commons)


    Quackgrass rhizome stems (Steve Dewey, Utah State University,


    Quackgrass clasping auricle and rolled leaf (The Ohio State University,


    • spreading habit; up to 1 – 3 feet tall if uncut
    • thick, rolled leaves; blue green in color; clasping auricle similar to annual ryegrass
    • spreading underground rhizomes
    • appears to have a thicker blade growing slightly faster than common Kentucky bluegrass
    • may be more prevalent in low-fertility and/or heavy clay or compacted soils


    • landscape, lawn and open spaces

    Life Cycle

    • aggressive perennial reproducing by seed or spreading by thin underground rhizome roots

    IPM Recommendations

    • Effective control must target both aboveground and underground plant structures.
    • Hand-pull plants in planting beds prior to seed maturation.
    • Apply a mulch layer 3 inches deep on planting beds to reduce seed germination.
    • Cultivation/tillage is not a good option since rhizomes will continue to grow after being cut.
    • If quackgrass is aggressively competing with desirable plants, apply an appropriate post-emergent systemic herbicide when plants are actively growing.