Yellow Nutsedge (often mistaken for a grass)
Cyperus esculentus · Warm-season, Perennial, C4 photosynthetic pathway
Grass Family
Cyperaceae (Sedge Family)
Grass Category
Invasive/Weed Grass (specifically a sedge)
Variety / Cultivar
Common Yellow Nutsedge (wild type)
Hardiness Zones
USDA Zones 4 through 11; dies back to the ground after the first frost, surviving winter as underground tubers.
About This Grass
An aggressive, erect sedge that grows faster than turfgrasses. It is distinguishable by its pale yellowish-green color, triangular stems, and spikes of yellowish-brown seed heads.
Blade Characteristics
Bright green to yellowish-green; waxy texture; blades are V-shaped in cross-section with a prominent midrib; width is medium (3-9mm); tips are long and tapered to a sharp point; vernation is folded.
Root System
Fibrous roots accompanied by a complex network of rhizomes and small, starch-rich underground tubers (nutlets) that can remain dormant for years.
Growing Information
Origin Region
Native to Southern Europe and Africa; widely naturalized across North America and Eurasia
Growth Habit
Rhizomatous with underground tubers (nutlets); spreads rapidly to form dense, upright colonies
Sunlight & Water Needs
Prefers full sun but tolerates partial shade; thrives in wet, poorly drained soils but is highly drought-tolerant once established due to tubers.
Mowing & Maintenance
High maintenance for control; mowing is ineffective as it grows faster than grass (appearing above the canopy within 2 days of mowing). Requires specific sedge-control herbicides (e.g., SedgeHammer).
Special Characteristics
Triangular stem (sedges have edges); extremely difficult to eradicate; tuber production allows it to survive extreme heat and mechanical pulling (which often triggers more tuber growth).
Ecological Information
Considered a noxious weed in turf; tubers provide food for some wildlife (waterfowl and hogs), but it is highly invasive in managed landscapes and agricultural fields.