Goosegrass has a divided spike-type seedhead bearing seeds in straight rows on the seed stalks. Goosegrass seeds germinate four to six weeks later than crabgrass and germination continues throughout the summer. Nimblewill is a blue-green perennial grass that is common in Pennsylvania lawns during summer. It spreads over existing turf by stolons and forms dense patches. The stems are long, slender, and wiry with prominent nodes.
Ligules are short, membranous, and jagged.
The leaf blades have long hairs at the margins but do not possess auricles. Seedheads are long, slender, and inconspicuous. Nimblewill grows rapidly during the warm summer months and turns brown or tan in winter. Orchardgrass is a bunch-type perennial grass weed that forms light green clumps in lawns. The sheaths of orchardgrass are strongly compressed and flattened.