Festuca argentina is a species of grass and a perennial herb; this species has a self-supporting growth form. This species is endemic to Argentina. This species often thrives in mountain slopes. This species was first described in 1935.
Festuca argentina can grow up to 28 centimetres, and has simple but broad leaves. This species can clump to a meter high with a long growth period. This species is poisonous to cattle and goats as when consumed; it causes a condition called huaicú disease, which can interrupt the reproductive system among cattle. This often happens when overgrazing occurs. Due to its appearance, it can stand out amongst many grasses.