Yellow Nutsedge (commonly mistaken for grass)
Cyperus esculentus · Warm-season perennial, C4 metabolism, not a true grass but a sedge
Grass Family
Cyperaceae (Sedge Family)
Grass Category
Invasive/Weed Grass, Wetland/Riparian Sedge
Variety / Cultivar
Wild type; no specific turf cultivar (often considered a weed in turf)
Hardiness Zones
USDA Zones 3-11; dies back to tubers after first heavy frost; dormant tubers survive extreme cold.
About This Grass
An upright, aggressive sedge that grows faster than surrounding turf. It has a distinctive yellowish-green color, a triangular stem cross-section, and produces small, bur-like seed heads/spikes. It stays taller than mowed turf between maintenance cycles.
Blade Characteristics
Width 4-10mm (medium to coarse); V-shaped or flat; sharply pointed tips; waxy texture with a prominent midrib; leaves are arranged in three ranks (basal). Ligules and auricles are absent.
Root System
Extensive fibrous roots combined with slender rhizomes that terminate in small, edible tubers (nutlets); very deep-rooted for its size; extremely difficult to hand-pull due to tuber detachment.
Growing Information
Origin Region
Native to Southern Europe, Africa, and the Middle East; naturalized globally in temperate and tropical regions
Growth Habit
Rhizomatous with underground tubers (nutlets); rapid upright spread, forms dense colonies
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-moisture areas.
Mowing & Maintenance
Grows faster than turf (requires frequent mowing to hide); standard turf heights (2-4 inches) do not suppress it; requires specific sedge-target herbicides; Low maintenance once established as it is extremely hardy.
Special Characteristics
Highly invasive in lawns; excellent salt tolerance; high heat tolerance; extremely difficult to eradicate because tubers can remain dormant for several years.
Ecological Information
Introduced in some regions, native in others; tubers provide food for waterfowl and small mammals; tends to indicate soil compaction or drainage issues in turf landscapes.