Yellow nutgrass is a type of weed that commonly grows in lawns and gardens. It is also known as nut sedge or yellow Cyperus. Some other synonyms for this weed include Tiger nut sedge, Water nut grass, Nut grass, and Chinese nut grass. The plant has thin yellow leaves that can reach up to three feet tall. It can be difficult to get rid of as the roots can grow deep into the soil. Yellow nutgrass is often considered a nuisance by gardeners as it can easily spread and compete with other plants for nutrients. If left unchecked, it can quickly take over an entire garden or lawn.