Perennial Ryegrass
Lolium perenne · Cool-season, Perennial, C3 grass
Grass Family
Poaceae, Pooideae, Tribe Poeae
Grass Category
Lawn/Turf Grass, Sports Turf, Forage
Variety / Cultivar
Common Perennial Ryegrass (cultivar not specified)
Hardiness Zones
USDA Zones 5-7 (and coastal 8-9); limited heat tolerance in the South; excellent cold tolerance but prone to winter kill in extreme northern zones.
About This Grass
A fine-textured, bright green grass that forms dense clumps. It is known for its fast germination and shiny leaf undersides. When unmowed, it can reach 12-24 inches; it produces slender, spiked seed heads with alternating spikelets directly attached to the rachis.
Blade Characteristics
Fine to medium (2-4mm); folded vernation; glossy/shiny underside; pointed tip; prominent veins on top surface; small, collar-like ligule; small, non-clasping auricles.
Root System
Fibrous and relatively shallow; fast establishment but lower drought tolerance than fescue; does not form a true sod due to bunch-forming habit.
Growing Information
Origin Region
Native to Europe, Asia, and North Africa; naturalized worldwide in temperate climates
Growth Habit
Bunch-type (clump-forming); lacks rhizomes or stolons
Sunlight & Water Needs
Full sun to partial shade (4-6 hours minimum); high water requirements; low drought tolerance; prefers well-drained fertile soil with pH 6.0-7.0.
Mowing & Maintenance
1.5 to 2.5 inches; high frequency; 2-4 lbs Nitrogen per 1000 sq ft yearly; medium maintenance; requires sharp mower blades due to tough vascular tissue.
Special Characteristics
Excellent traffic and wear tolerance; fastest germination rate of all cool-season grasses; susceptible to Grey Leaf Spot and Pythium Blight; excellent soil stabilization.
Ecological Information
Introduced status in North America; used for erosion control and quick cover; high forage value for livestock; often mixed with Kentucky Bluegrass for better wear and recovery.