Yellow Nutsedge
Cyperus esculentus · Warm-season, Perennial sedge (C4 photosynthetic pathway)
Grass Family
Cyperaceae (Sedge family)
Grass Category
Invasive/Weed Grass (Technically a sedge, commonly managed as a turf weed)
Variety / Cultivar
Wild type (not typically cultivated as a turf variety)
Hardiness Zones
USDA Hardiness Zones 3 to 9. Tolerates cold winters via dormant underground tubers and thrives in hot summer conditions.
About This Grass
An upright, yellowish-green perennial sedge with triangular stems. Grows faster than surrounding turfgrass, standing out prominently. Typically reaches 1 to 2 feet in height if left unmowed. Produces distinctive yellow-brown, spikelet-type seed heads resembling umbrellas.
Blade Characteristics
Leaves are narrow (3-8 mm wide), grass-like, V-shaped in cross section, shiny, yellow-green to light green. The stem is distinctly triangular (three-sided), which is the classic characteristic of sedges ('sedges have edges'). Ligules are absent, and auricles are absent.
Root System
Shallow to moderate fibrous root system that produces small, nut-like tubers (nutlets) at the tips of rhizomes. These tubers store energy and make it extremely difficult to eradicate once established. Fast establishment in wet soils.
Growing Information
Origin Region
Cosmopolitan distribution; native to North America and Eurasia, found worldwide in moist soils
Growth Habit
Stoloniferous and rhizomatous, spreading aggressively via underground tubers (nutlets) and roots
Sunlight & Water Needs
Thrives in full sun and poorly drained, excessively wet, or over-watered soils. Poor drought tolerance once active, but dormant tubers survive dry periods easily. Prefers moist, heavy soils with a wide pH range.
Mowing & Maintenance
Requires frequent mowing because it grows much faster than most turfgrasses. Mowing low helps suppress it temporarily, but standard mowing heights (2-3 inches) will not eliminate it. High maintenance required for control; chemical treatments (specific sedge herbicides) are often necessary.
Special Characteristics
Extremely poor wear tolerance as a lawn weed, but highly resilient due to underground nutlets. Resistant to most standard broadleaf and grassy weed herbicides; requires specialized selective herbicides (e.g., halosulfuron or sulfentrazone). Highly invasive in wet lawns and gardens.
Ecological Information
Introduced and native variants exist globally. Provides minor food source for some waterfowl and small mammals digging for tubers, but generally considered a troublesome agricultural and horticultural weed due to its rapid proliferation in damp environments.