Barnyard Grass (Echinochloa crus-galli), also known as Cockspur Grass or Japanese Millet, is a fast-growing annual grass found in wetland environments, floodplains, ditches, and low-lying pastures across temperate and tropical regions worldwide. Belonging to the Poaceae family, it is a robust species recognized for its coarse, upright stems and dense, bristly seed heads that resemble a cock’s spur—hence one of its common names.

Native to Eurasia but now widespread, Barnyard Grass thrives in disturbed, moist soils and is often associated with rice paddies, where it can become a competitive weed. Despite its invasive potential, it is valued in certain contexts as a forage crop for livestock and as a cover crop due to its rapid biomass production.

It plays a role in wetland ecosystems by stabilizing soil and supporting wildlife. With its adaptability and high growth rate, Echinochloa crus-galli is both an agricultural challenge and an ecological asset, depending on context.