Yellow Nutsedge (often mistaken for a grass)
Cyperus esculentus · Warm-season, Perennial, C4 monocot (Technically a sedge, not a true Poaceae grass)
Grass Family
Cyperaceae (Sedge Family)
Grass Category
Invasive/Weed Grass, Wetland/Riparian, Forage
Variety / Cultivar
Wild type (No specific landscape cultivar; often considered a weed in turf)
Hardiness Zones
USDA Zones 3-11; very heat tolerant; foliage dies back to the ground after first hard frost, surviving as underground tubers.
About This Grass
An erect, grass-like perennial reaching 6-30 inches if unmowed. It is distinguished by its yellowish-green color and rapid growth rate that often outpaces surrounding turf. Seed heads (infrequently seen in mowed lawns) are yellowish-brown, umbrella-like clusters of spikes.
Blade Characteristics
Blades are medium-to-coarse (4-10mm), V-shaped (channeled) in cross-section, with a very prominent midrib. The stem is triangular (3-sided), which is a key diagnostic feature. Tips are long-tapered to a sharp point. Leaves have a waxy, shiny cuticle.
Root System
Fibrous roots with extensive rhizomes and small starchy tubers (nutlets). High thatch-forming tendency in wet soils; extremely fast establishment and difficult to eradicate once tubers form.
Growing Information
Origin Region
Native to North and South America, Europe, Africa, and Asia; pan-tropical and temperate
Growth Habit
Rhizomatous with tubers (nutlets); produces underground runners and characteristic small brown tubers at the root ends
Sunlight & Water Needs
Full Sun to Partial Shade; prefers wet or poorly drained soils but is highly drought tolerant once tubers are established; thrives in high humidity.
Mowing & Maintenance
Grows faster than traditional turf; requires frequent mowing to mask height differences. Maintenance level is high because it is resistant to many standard selective grass herbicides. Manual pulling is often ineffective as tubers remain in the soil.
Special Characteristics
Exceptional vertical growth rate; high moisture tolerance; very difficult to control due to 'nutlets'; distinctive triangular stem ('Sedges have edges'); shiny/waxy leaf texture.
Ecological Information
Native species but often invasive in managed landscapes. Tubers provide food for waterfowl and wildlife (such as wild turkeys). Excellent for soil stabilization in wetlands but considered a major agricultural and turf weed.