Yellow Nutsedge
Cyperus esculentus · Warm-season, Perennial, C4 sedge
Grass Family
Cyperaceae (Sedge Family)
Grass Category
Invasive/Weed Grass (technically a sedge), Wetland/Riparian, and occasionally an edible crop (Chufa)
Variety / Cultivar
Common wild type (often regarded as a weed in turf contexts)
Hardiness Zones
USDA Zones 3-10. Dormant in winter; shoots die back to the ground after a hard frost while tubers survive underground.
About This Grass
An erect, grass-like perennial reaching 12-36 inches if unmowed. It features distinct triangular stems and a vibrant yellowish-green color. It typically grows faster than surrounding lawn grasses, creating an uneven canopy.
Blade Characteristics
Blade width is medium (3-8mm), V-shaped in cross-section with a prominent mid-vein. Tips are long and sharply pointed. Vernation is folded. Lack of ligules and auricles differentiates it from true Poaceae family grasses.
Root System
Fibrous roots combined with a network of slender rhizomes and persistent underground tubers. Low thatch but high tuber density; extremely difficult to eradicate once established.
Growing Information
Origin Region
Native to most of the Northern Hemisphere, including North America, Southern Europe, and Africa; well-adapted to worldwide temperate and tropical regions
Growth Habit
Rhizomatous and tuberous; spreads rapidly via underground rhizomes that produce small starchy tubers (nutlets) and new shoots
Sunlight & Water Needs
Thrives in Full Sun, though tolerates Partial Shade. High water needs; prefers moist, poorly drained sites but is surprisingly drought-tolerant once tubers are established.
Mowing & Maintenance
Maintenance is usually aimed at eradication. Frequent mowing at 2-3 inches can reduce seed production but does not kill underground tubers. High maintenance required for control (sedge-specific herbicides).
Special Characteristics
Exceptional ability to outcompete turf in wet conditions. Features a unique 'triangular' stem (sedges have edges). Resistant to most standard broadleaf and grass-specific herbicides.
Ecological Information
Introduced/Native depending on specific subspecies; tubers are a significant food source for waterfowl and wild hogs. High invasive potential in managed landscapes and agricultural fields.