quack grass

noun

\ˈkwak-

Definition of quack grass

: a European grass (Elytrigia repens synonym Agropyron repens) that is naturalized throughout North America and spreads by creeping rhizomes

— called also couch grass, quitch, twitch, witchgrass

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Buckwheat This fast-growing non-wheat crop is excellent at suppressing weeds like quack grass. — Sunset, "Top 10 Cover Crops for Your Fall Garden," 22 Jan. 2018

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The first known use of quack grass was circa 1818

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quack grass

noun

Medical Definition of quack grass

: a European grass of the genus Agropyron (A. repens) that is naturalized throughout North America and has roots and rhizome with diuretic properties

— called also couch grass, quitch, twitch, witchgrass