Yellow Nutsedge
Cyperus esculentus · Warm-season, Perennial, C4 sedge
Grass Family
Cyperaceae (Sedge family)
Grass Category
Weed Grass / Invasive Sedge
Variety / Cultivar
Wild type (not typically cultivated as a turfgrass)
Hardiness Zones
USDA Hardiness Zones 3-10; highly adaptable to temperate and tropical climates.
About This Grass
An upright, grass-like perennial weed characterized by triangular stems and yellowish-green to bright green shiny leaves. Grows up to 1-3 feet tall. Notable for its distinctive spiky, yellowish-brown umbrella-like seed heads and nutlets formed on roots.
Blade Characteristics
Medium to coarse width (3-8mm), flat, V-shaped in cross-section, pointed tips, bright yellowish-green and shiny. Leaf arrangement is typically in sets of three (triangular stem). Ligules are absent, auricles absent.
Root System
Fibrous root system featuring underground rhizomes that terminate in small, edible tubers called nutlets (nuts). Establishes rapidly in wet soils and spreads aggressively.
Growing Information
Origin Region
Cosmopolitan distribution; native to North America and Eurasia, found worldwide in wet, disturbed soils.
Growth Habit
Rhizomatous and stoloniferous, producing underground tubers (nutlets) that rapidly form dense, upright clumps.
Sunlight & Water Needs
Requires full sun and thrives in poorly drained, wet, or over-irrigated soils. Extremely high water needs; poor drought tolerance during severe dry spells but persistent due to tubers.
Mowing & Maintenance
Grows faster than typical turfgrass, often standing out above a lawn a day or two after mowing. Requires selective herbicide management (sedge hammers) rather than standard mowing control, as regular mowing stimulates lateral growth.
Special Characteristics
Low traffic/wear tolerance, highly invasive in lawns and agricultural fields, resistant to standard broadleaf herbicides, thrives in compacted and wet soils, difficult to eradicate due to underground tubers.
Ecological Information
Often considered a noxious agricultural weed, though tubers provide a food source for some wildlife and waterfowl. Indicates poor drainage or excessive soil moisture in managed turf.