Annual Ryegrass
Lolium multiflorum · Cool-season, Annual, C3
Grass Family
Poaceae, subfamily Pooideae, tribe Poeae
Grass Category
Lawn/Turf, Pasture/Forage, Erosion Control, Cover Crop
Variety / Cultivar
Standard / Common Annual Ryegrass (often used in 'Contractor Mixes')
Hardiness Zones
USDA Zones 6-9 (as a winter annual) or 3-7 (as a summer annual); poor heat tolerance; dies out when temperatures consistently exceed 85-90°F.
About This Grass
A shiny, lime-green vigorous grass that grows in distinct clumps. It features a glossy leaf undercoat and a succulent texture. It reaches 12-36 inches if unmowed and is often used for quick temporary cover.
Blade Characteristics
Width: 4-10mm (medium to coarse); rolled in the bud (vernation); pointed tips; glossy/shiny underside; long clasping auricles; membranous ligule; visible veins on top.
Root System
Fibrous and relatively shallow; incredibly fast establishment (3-7 days); very low thatch tendency due to annual life cycle; moderate wear recovery through rapid growth.
Growing Information
Origin Region
Native to Southern Europe; widely naturalized across North America and temperate global climates.
Growth Habit
Bunch-type (clump-forming); rapid upright growth with no rhizomes or stolons.
Sunlight & Water Needs
Full sun to partial shade; high water requirement for peak performance; low drought tolerance; prefers moist, fertile loams with pH 5.5-7.5.
Mowing & Maintenance
Height: 2.0-4.0 inches; high frequency required due to rapid growth rate; fertilization: 2-4 lbs N/1000 sq ft/year; maintenance level: Low to Medium.
Special Characteristics
Excellent 'nurse' grass for slow-growing species; highest germination speed of common turfgrasses; poor salt tolerance; excellent erosion control due to rapid stabilization.
Ecological Information
Introduced species; high forage value for livestock; provides quick soil stabilization; can become a weed in small grain agricultural crops; often used in blends with Kentucky Bluegrass or Tall Fescue.