yellow nutsedge

Yellow nutsedge (Cyperus esculentus). Photo: HGIC, U of MD Extension

Updated: July 21, 2021

Life cycle 

Yellow nutsedge (Cyperus esculentus) is an invasive perennial; classified as a sedge not technically a grass. Its nativity to Maryland is uncertain.

Growth habit 

Leaves are shiny, yellow-green, narrow, and grass-like; stems are 3-sided, triangular in cross-section.

Reproduction 

From small nutlets (tubers) attached to rhizomes; may also spread by seeds.

Conditions that favor growth 

Colonizes wet areas with poor drainage; diverting water or improving drainage can help reduce the weed infestation.

Photos

Roots

Yellow nutsedge roots and tubers

Photo: Sabine Harvey, University of Maryland Extension

Stem

Yellow nutsedge stem is triangular

Photo: Ohio State Weed Lab, The Ohio State University, Bugwood.org

Flowers

Yellow nutsedge flowers

Photo: University of Maryland Extension

Nutlet and rhizomes

Yellow nutsedge nutlets and rhizomes

Photo: Betty Marose, University of Maryland Extension

Management in lawns

Cultural lawn care practices

Maintain healthy, dense turf that can compete and prevent weed establishment.

Mechanical management

Digging out or using an appropriate weeding tool to remove the underground 'nutlets' is the primary means of mechanical control of nutsedge. This is a viable option at the beginning of an infestation and on young weeds.

Chemical management in lawns 

Spot treat the areas that have nutsedge with a liquid, selective herbicide that contains the active ingredient: Common Name: Halosulfuron; Trade Name: Sedgehammer and others or Common Name: Sulfentrazon