Poa annua, commonly known as annual bluegrass or annual meadow grass, is a small, clump-forming, cool-season annual or perennial grass native to temperate regions from Europe to Asia. It typically grows 6-10 inches high and has a light green color with a tufted habit. Annual bluegrass thrives in moist, fertile soils often found in disturbed areas, including golf courses, lawns, and gardens, as well as in various habitats such as meadows, open woodlands, and grasslands. It produces small, inconspicuous flowers in the spring and can sometimes flower again in the fall if conditions are favorable.

Annual bluegrass is valued for its ability to quickly establish in cool seasons and provide a temporary green cover. It is often found in lawns, where it can be considered a weed due to its prolific seeding and ability to outcompete other grasses. In cultivation, it prefers moist conditions but can tolerate a wide range of soils. It is often used in overseeding programs on golf courses to provide winter color. However, it can become a nuisance due to its invasive nature and potential to develop resistance to herbicides. It is also susceptible to a variety of diseases, including anthracnose and Pythium blight.CC BY-SA 4.0