Virginia Tech Weed Identification Guide

Annual Bluegrass: Poa annua

Weed Description: An erect or clump-forming annual grass that tolerates close mowing, or may reach 11 inches in height. Primarily a weed of lawns and turfgrass, found throughout the United States.
Leaves: Light green in color, especially when compared to the dark green color of other closely related turfgrass species (for example Kentucky Bluegrass, Poa pratensis). Leaf blades are 0.5-5 inches long, 1-5 mm wide, folded in the bud and lack hairs on either surface. Leaves are 'keeled' and have a distinctive boat-shaped tip. The ligule is slightly pointed and membranous. Leaf sheaths are somewhat compressed and flattened, without hairs.
poaan3-30.jpg (75549 bytes) Stems: May be either erect or bending, and may root at the base of the tillers.

Flowers: The seedhead is an open panicle, 3/4 to 2.5 inches long, and pyrimidal in outline.

Roots: Fibrous.

Identifying Characteristics: Light green grass with a boat-shaped leaf tip that resembles other lawn and turfgrass species. This weed is very similar to Kentucky Bluegrass (Poa pratensis), but is much lighter in color and lacks rhizomes.