(More Lawn Weeds)
Yellow nutsedge
Cyperus esculentus
Life cycle
Perennial; Classified as a sedge not technically a grass.
Growth habit
Leaves shiny, yellow-green, narrow, and grass-like; stems are 3-sided, triangular in cross section.
Reproduction
From small nutlets (tubers) attached to rhizomes/possibly seed.

Nutsedge spreads by offshoots as well as seed

Yellow nutsedge seed spike
Conditions that favor growth
Colonizes wet areas with poor drainage; diverting water or improving drainage can help reduce the weed infestation.
Management In Lawns
- Cultural practice
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: Sulfentrazone
- Organic Lawn Herbicides