Johnsongrass Quackgrass Official Control Program Description Quackgrass is a perennial, reproducing by seed and underground rootstocks.
Roots arise only at the nodes.
Stems grow up to 3 feet tall with 3 to 6 joints. Leaves are wide, shiny, and dark green in color. The lower dry sheaths, leaves, and stems are distinctly hairy. Upper sheaths glabrous or nearly so. Terminal spikes are 2 to 4 inches long and have 3 to 7 short-awned florets in a spikelet.