Kentucky Bluegrass
Poa pratensis · Cool-season, Perennial, C3 grass
AI-generated identification · may be incorrect
Grass Category
Lawn/Turf Grass, Sports Turf, Golf Course Grass
Hardiness Zones
USDA Hardiness Zones 3 to 7, thriving in northern temperate climates. Excellent cold tolerance, goes semi-dormant in extreme winter cold, and struggles in prolonged extreme summer heat of the deep south.
Grass Family
Poaceae, subfamily Pooideae, tribe Poeae
Variety / Cultivar
Standard turf-type cultivar (e.g., 'Midnight' or 'Baron')
About This Grass
A dense, high-quality turf grass forming a deep blue-green to dark green carpet. Can grow up to 18 to 24 inches if unmowed, but maintained as a lawn at 1.5 to 2.5 inches. Fine to medium texture with excellent density and a boat-shaped leaf tip.
Blade Characteristics
Medium-fine blades (2-4mm wide), flat to folded with prominent parallel veins and a classic boat-shaped tip. Vernation is folded in the bud. Ligule is short and membranous, auricles are absent, and the collar region is broad and distinct.
Root System
Moderate depth (6-12 inches) with an extensive fibrous root system and aggressive underground rhizomes. Forms a thick, tough sod that exhibits moderate thatch tendencies and slow to moderate establishment speed.
Growing Information
Origin Region
Europe and Northern Asia; widely naturalized and cultivated across North America and cool temperate regions worldwide
Growth Habit
Aggressively rhizomatous, forming a dense, uniform turf mat and sod
Sunlight & Water Needs
Requires full sun (at least 6-8 hours daily) with moderate to high water needs. Moderate drought tolerance, going dormant in severe drought and greening up when moisture returns. Prefers well-drained, fertile soils with a pH between 6.0 and 7.0.
Mowing & Maintenance
Ideal mowing height is 2.0 to 3.0 inches. Medium to high maintenance level requiring regular mowing, moderate to high fertilization (3-4 lbs N per 1000 sq ft annually), periodic dethatching, and aeration.
Special Characteristics
Outstanding wear tolerance and self-healing capacity due to rhizomes. Fair shade tolerance compared to fine fescues. Good resistance to heavy traffic, excellent drought recovery, and forms a tight sod that crowds out weeds effectively.
Ecological Information
Introduced species in North America. Provides low wildlife forage value compared to native prairie species, but excellent for soil stabilization, erosion control, and urban heat island mitigation. Commonly blended with perennial ryegrass and fine fescues.