Yellow nutsedge (Cyperus esculentus) is a warm season perennial, grass like species that is native to Europe. It is particularly noticeable in July and August when it grows more quickly than native species and stands out (visually) above the rest. The seeds are yellowish, triangular, and oblong. The root system, which is made up of tubers, can produce hundreds to thousands of tubers in a season per plant; the tubers can survive 3 to 4 years. Seedling stems are triangular in cross section with smooth, hairless leaves. Plants range from 6 to 30 inches tall, with 3 ranked leaves and triangled pithy stems. The leaves are grass like that originate from the base of each stem and are folded lengthwise. Long leaf-like bracts branch out from a common point just below the umbrella-like flower cluster. Flowers are yellowish-brown in color and appear from June to October. The entire cluster of flat spikelets is subtended by 3 to 9 leaf-like bracts and has up to 40 florets.
Yellow nutsedge Fact Sheet