Annual Ryegrass
Lolium multiflorum · Cool-season Annual, C3
Grass Family
Poaceae, Pooideae, Tribe Poeae
Grass Category
Lawn/Turf, Pasture/Forage, and Erosion Control grass
Variety / Cultivar
Common / Viterseed variety
Hardiness Zones
USDA Zones 6-9 (as an annual); sensitive to extreme heat and prolonged freezing; goes dormant or dies in high summer heat.
About This Grass
A vigorous, bright green grass that grows in upright clumps. It is known for extremely rapid germination and establishment. It has a shiny, waxy appearance on the leaf undersides and can grow 12-36 inches tall if unmowed.
Blade Characteristics
Medium width (3-7mm), flat shape, pointed tip, bright green color with high gloss on the underside, rolled vernation in the bud, prominent veins on upper surface, large claw-like auricles, and a short membranous ligule.
Root System
Fibrous and relatively shallow; lacks rhizomes or stolons but forms a very dense root mass quickly, providing excellent initial erosion control but poor long-term drought recovery.
Growing Information
Origin Region
Native to Europe, North Africa, and temperate Asia; naturalized worldwide in temperate zones
Growth Habit
Bunch-type (clumping), fast-growing, non-rhizomatous
Sunlight & Water Needs
Full sun to partial shade; requires high moisture and frequent watering but does not tolerate standing water; prefers fertile, loamy soils with pH 5.5-7.5.
Mowing & Maintenance
Ideal height 1.5-3.0 inches; requires frequent mowing due to rapid growth; low to medium maintenance; often used for temporary winter overseeding only.
Special Characteristics
Excellent wear tolerance during its peak growth; very high germination speed; used as a 'nurse grass' in mixes; poor heat and drought tolerance compared to perennials.
Ecological Information
Introduced species; high forage value for livestock; provides quick ground cover to prevent soil erosion; can become a weed in grain crops or natural areas if allowed to seed.