Calamagrostis is a genus of perennial grasses that are commonly known as reedgrass or a needle grass. The various species of Calamagrostis are widely distributed in temperate regions, including North America, Eurasia, and Africa. Some synonyms that are often used for Calamagrostis include reed bentgrass, feather reedgrass, Kamchatka reedgrass, and alpine reedgrass. These grasses are popular in landscaping and garden designs due to their ornamental value, which includes their attractive seed heads and fluffy plumes. In addition, they are also used for erosion control, as they have deep root systems that can prevent soil from washing away during heavy rains or floods.