Kentucky Bluegrass
Poa pratensis · Cool-season, Perennial, C3 photosynthetic pathway
Grass Family
Poaceae, Subfamily Pooideae, Tribe Poeae
Grass Category
Lawn/Turf Grass, Sports Turf, Erosion Control
Variety / Cultivar
Likely a common Type or Midwest-adapted cultivar; exhibits high density and medium-green coloration consistent with standard residential turf blends.
Hardiness Zones
USDA Hardiness Zones 2-7; excellent cold tolerance; poor heat tolerance in the Deep South; goes dormant (brown) during extreme summer heat or winter freezes.
About This Grass
A dense, low-to-medium growing turf grass with a characteristic dark-to-medium green color. It produces a soft, lush carpet. If left unmowed, it reaches 12-24 inches with open, pyramidal seed head panicles. Texture is generally fine to medium.
Blade Characteristics
Fine to medium width (2-4mm); folded vernation; distinct boat-shaped leaf tip (keeled); smooth blade surface with a prominent double mid-vein. Ligule is short and membranous; auricles are absent.
Root System
Relatively shallow fibrous root system combined with vigorous rhizomes. It forms a heavy thatch layer over time and has a high establishment speed via sod, though moderate from seed.
Growing Information
Origin Region
Native to Europe, Northern Asia, and the mountains of Morocco and Algeria; highly adapted to temperate climates of North America.
Growth Habit
Rhizomatous (spreading via underground stems), forming a dense, resilient sod that recovers well from traffic.
Sunlight & Water Needs
Prefers Full Sun (6+ hours) but can tolerate light shade; requires consistent moisture (~1 inch per week) and has moderate drought tolerance (enters dormancy during heat/drought).
Mowing & Maintenance
Ideal height 2.0 to 3.5 inches; high maintenance level requiring frequent fertilization (3-5 lbs N per 1000 sq ft annually) and regular dethatching/aeration.
Special Characteristics
Excellent wear tolerance and recovery due to rhizomes; susceptible to leaf spot, melting out, and necrotic ring spot; high aesthetic value for home lawns.
Ecological Information
Introduced/Naturalized in North America; provides soil stabilization and prevents erosion; serves as brood cover for various insects and forage for small mammals.