Paspalum distichum, commonly known as knotgrass, is a perennial grass originally native to the USA to the tropical Americas, including the Caribbean, Central America, and South America. It has since become widespread in many other regions. Knotgrass typically forms dense clumps and spreads aggressively via rhizomes and stolons, reaching up to 24 inches in height. It thrives in a variety of habitats, including wetlands, riverbanks, and moist open areas, where it often forms a dominant ground cover.

Knotgrass is valued for its ability to stabilize soil and prevent erosion, particularly in wet areas. It is also used as a forage grass in pastures due to its rapid growth and adaptability to wet conditions. In cultivation, it prefers full sun to partial shade and can tolerate a range of soil types, provided they are moist. It requires regular watering and can be mowed to maintain a tidy appearance. However, its invasive nature should be considered before planting, as it can outcompete native vegetation and alter ecosystems.CC BY-SA 4.0