Quackgrass leaf sheaths are rounded and may have short hairs but hairs typically can be found only near the base of the plant. Leaves are rolled in the bud and are approximately 1 1/2 to 12 inches long.

Leaves may or may not have hairs on the upper surfaces, but lower leaf surfaces are without hairs.

Seedheads are a long, narrow spike consisting of many individual spikelets arranged in 2 rows along the stem.