IPM1007, Revised November 2009
Summer annual grass
A summer annual with thick stems that may reach 5 feet in height. One of the few grass weeds in which ligules are absent. Seedlings have leaves that are without hairs, auricles, or ligules, and the leaf sheaths are often tinted red or maroon at the base. Mature plants have leaves that range from 4 to 20 inches in length and may be 5 to 30 mm wide. Leaves have a distinct white midvein that becomes keeled toward the basal potions of the leaf. Seedheads are a terminal panicle ranging from 4 to 16 inches in length that may be green to purple in color. The characteristic absent ligule of barnyardgrass helps to distinguish this weed from most other grasses in both the seedling and mature stages of growth.
IPM1007, revised November 2009
Order publications online at http://extension.missouri.edu/explore/shop/ or call toll-free 800-292-0969.