Perennial Ryegrass
Lolium perenne L. · Cool-season, Perennial, C3
Grass Family
Poaceae, Pooideae, Tribe Poeae
Grass Category
Lawn/Turf, Pasture, and Riparian stabilization
Variety / Cultivar
Common or Turf-type mix (v. undetermined)
Hardiness Zones
USDA Zones 5-7; excellent cold tolerance; poor heat and drought tolerance; remains green late into fall.
About This Grass
A fine-to-medium textured grass with a rich green color and high luster on the underside of blades. Typically grows 6-24 inches if unmowed, featuring a spiked seed head with alternating spikelets.
Blade Characteristics
Fine to medium width (2-4mm); folded vernation; pointed tips; prominently ridged on top and glossy/shiny on the underside; small membranous ligule; auricles small or absent.
Root System
Fibrous and relatively shallow; fast establishment from seed; low thatch tendency; moderate wear recovery through tillering.
Growing Information
Origin Region
Europe, Asia, and northern Africa; well-adapted to temperate maritime climates
Growth Habit
Bunch-type (clump-forming); non-spreading but can form a dense mat through high tiller density
Sunlight & Water Needs
Full sun to partial shade; high water requirement; low drought tolerance; prefers fertile, well-drained soils with pH 6.0-7.0.
Mowing & Maintenance
1.5 to 2.5 inches height; frequent mowing; 2-4 lbs Nitrogen/1000 sq ft/year; low-to-medium maintenance level in riparian zones.
Special Characteristics
Rapid germination (5-7 days); excellent wear tolerance; competitive against weeds; often used as a nurse grass in cool-season blends.
Ecological Information
Introduced in North America; provides forage for livestock and deer; excellent for soil stabilization along pond banks to prevent erosion.