Groundcover or ground cover is any plant that grows over an area of ground. Groundcover provides protection of the topsoil from erosion and drought.
In an ecosystem, the ground cover forms the layer of vegetation below the shrub layer known as the herbaceous layer. The most widespread ground covers are grasses of various types.
In ecology, groundcover is a difficult subject to address because it is known by several different names and is classified several different ways. The term groundcover could also be referring to “the herbaceous layer,” “regenerative layer “ground flora” or even "step over."
In agriculture, ground cover refers to anything that lies on top of the soil and protects it from erosion and inhibits weeds.
Grass is a type of plant. A common kind of grass is used to cover the ground in a lawn and other places.
Graminoids are a broader group which includes the grasses. They are monocotyledons, usually herbaceous plants with narrow leaves growing from the base. They include the "true grasses", of the family Poaceae (also called Gramineae), as well as the sedges (Cyperaceae) and the rushes (Juncaceae). These three families are not closely related but belong to different clades in the order Poales.