Definition of "quackgrass" []

• A species of grass, Elytrigia repens (noun)

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• "May 3, 2008 at 5:59 am poppies quick-growin quackgrass rose-culored roses s…"
• "After a season of neglect, even these tough flowers were losing ground to the bindweed and quackgrass and spurge."
• "Other plants also are "totally tied up with our culture," he says, even reviled weeds like dandelions, once considered a decorative herb, and noxious grasses such as crabgrass and quackgrass, used to fuel the engines of commerce - horses and mules."