Quackgrass
Elytrigia repens · Cool-season, Perennial, C3 grass
AI-generated identification · may be incorrect
Grass Category
Invasive/Weed Grass
Hardiness Zones
USDA Hardiness Zones 3 through 9; highly cold-tolerant and survives severe winters, going dormant in extreme cold.
Grass Family
Poaceae, subfamily Pooideae, tribe Triticeae
Variety / Cultivar
Wild type (considered a noxious weed)
About This Grass
Quackgrass is a persistent, aggressive perennial weed grass with bright to light green foliage and a coarse texture. It grows in loose clumps or patches, often outcompeting desirable turfgrasses. Heights can reach 1.5 to 3 feet if unmowed, but it tolerates low mowing by spreading horizontally. Seed heads are slender spikes resembling miniature wheat.
Blade Characteristics
Blades are medium-width (4-8 mm), flat, soft, pointed at the tips, and light to blue-green. Vernation is rolled in the bud. Prominent feature includes clasping auricles (claw-like appendages wrapping around the stem at the collar) and a membranous, very short ligule.
Root System
Extensive, deep, aggressive rhizomatous root system with yellowish-white, sharp-pointed rhizomes that easily pierce other roots and soils. High tendency to form thick mats and thatch. Spreads rapidly and recovers quickly from damage.
Growing Information
Origin Region
Europe and temperate Asia; widely naturalized throughout North America, temperate regions worldwide
Growth Habit
Aggressively rhizomatous, forming a dense, coarse network of underground creeping stems
Sunlight & Water Needs
Thrives in full sun to partial shade. Adapts to a wide variety of soil types and moisture levels, showing good drought tolerance once established due to deep rhizomes. Prefers neutral to alkaline soils.
Mowing & Maintenance
Tolerates frequent mowing down to 1.5 to 2 inches, though mowing will not eradicate it. High maintenance if attempting to control mechanically or chemically, as any remaining root fragment can regenerate.
Special Characteristics
Exceptional wear tolerance and ability to crowd out desirable turfgrasses. High resistance to drought once established. Considered a severe agricultural and lawn weed due to difficult eradication.
Ecological Information
Introduced invasive species in North America. Provides minimal desirable wildlife forage value compared to native grasses. Its extensive root system offers strong soil stabilization and erosion control, but its aggressive nature makes it a weed in managed landscapes and agricultural fields.