Cheatgrass, AKA Downey Brome (Bromus tectorum)
Annual grass. Plants are usually 12 to 18 inches tall.
Inflorescence, cheatgrass is slender 3/8 to 3/4 inch long, drooping; usually turns purple at maturity. Leaves are flat and covered in soft hairs. Reproduces from seed. Likes to establish in disturbance areas. The key to eradicating cheatgrass is diligence—once you begin the process you must be persistent and continue to follow up treatments for up to four or five years (or however long it might take) because cheatgrass seed may survive in soils this long.
*After maturity cheatgrass becomes a nuisance and a fire hazard.