Kentucky Bluegrass
Poa pratensis · Cool-season, Perennial, C3 grass
AI-generated identification · may be incorrect
Grass Category
Lawn/Turf Grass, Sports Turf
Hardiness Zones
USDA Hardiness Zones 3-7. Excellent cold tolerance, but struggles with extreme summer heat unless irrigated.
Grass Family
Poaceae, subfamily Pooideae, tribe Poeae
Variety / Cultivar
Common blend (e.g., 'Midnight', 'Bewitched')
About This Grass
Forms a dense, medium-textured turf with a rich blue-green to dark green color. Reaches up to 18-24 inches if unmoved, but maintained at 1.5-2.5 inches. Prone to summer dormancy under drought stress.
Blade Characteristics
Medium width (2-4mm), folded in the bud (vernation), boat-shaped tips, prominent parallel veins with a characteristic double tram-line appearance. Ligule is short and membranous; auricles are absent.
Root System
Moderately deep fibrous root system with extensive aggressive rhizomes. Forms a very tough, dense sod. Moderate establishment speed from seed.
Growing Information
Origin Region
Europe and Northern Asia; widely naturalized and cultivated across North America, performing best in northern temperate climates.
Growth Habit
Rhizomatous, spreading vigorously via underground stems to form a dense, uniform turf mat.
Sunlight & Water Needs
Requires full sun (at least 6-8 hours daily), though some cultivars have moderate shade tolerance. High water needs to maintain green color during summer; enters dormancy under drought.
Mowing & Maintenance
Mowing height between 1.5 to 2.5 inches. High maintenance level requiring regular fertilization (3-4 lbs N per 1000 sq ft yearly), periodic aeration, and irrigation.
Special Characteristics
Exceptional wear tolerance and self-repairing capability via rhizomes. Moderate shade tolerance. Prone to thatch accumulation and certain diseases like dollar spot and leaf spot.
Ecological Information
Introduced species in North America. Provides good soil stabilization and erosion control due to dense root and rhizome network. Often blended with Perennial Ryegrass and Fine Fescue.