Perennial grass refers to grass species that live for more than two years, regrowing each season from their root systems. These grasses are important for ecosystems, providing habitat for wildlife and preventing soil erosion. Common examples include Kentucky bluegrass and fescue, which are often used in lawns and pastures. Unlike annual grasses, which complete their life cycle in one year, perennial grasses can thrive in various climates and conditions. They are typically more resilient and require less maintenance once established. Their deep root systems help them access water and nutrients, making them valuable for sustainable agriculture and landscaping.