Kentucky Bluegrass
Poa pratensis · Cool-season, Perennial, C3 grass
AI-generated identification · may be incorrect
Grass Category
Lawn/Turf Grass, Sports Turf, Erosion Control
Hardiness Zones
USDA Hardiness Zones 3 to 7, exceptionally cold-tolerant, struggles in extreme southern heat zones without heavy irrigation, goes dormant (turns brown) during periods of summer heat and drought.
Grass Family
Poaceae, subfamily Pooideae
Variety / Cultivar
Common blend (not specific, typical utility-grade Kentucky Bluegrass)
About This Grass
Dense, medium-textured turf with an attractive emerald to dark green color. Forms a tight, carpet-like lawn with good upright growth. Unmowed height can reach 12 to 24 inches, but typically maintained at 2 to 3 inches. Produces open, pyramidal panicle seed heads at maturity in late spring.
Blade Characteristics
Medium width (2-4mm), flat to V-shaped blades with distinctive boat-shaped tips, prominent parallel veins, and a smooth texture. Vernation is folded in the bud. Ligule is short and membranous, auricles are absent.
Root System
Moderate depth (6-18 inches) fibrous root system with extensive aggressive rhizomes. Forms a dense, tough sod. Tends to build up moderate thatch over time. Slow to establish from seed, but recovers well from damage due to rhizomatous spread.
Growing Information
Origin Region
Europe and Northern Asia; widely naturalized and cultivated across North America and temperate regions worldwide, performing best in northern climates.
Growth Habit
Rhizomatous, spreading aggressively via underground stems to form a dense, uniform, sod-forming turf.
Sunlight & Water Needs
Requires full sun (minimum 6-8 hours daily), moderate to high water needs to maintain green color during summer heat, fair drought tolerance entering dormancy during severe dry spells, prefers well-drained, fertile soils with a pH of 6.0 to 7.0.
Mowing & Maintenance
Ideal mowing height is 2.0 to 3.0 inches. Medium to high maintenance level. Requires regular fertilization (3-5 lbs N per 1000 sq ft per year), regular irrigation, occasional dethatching and core aeration, and overseeding when necessary.
Special Characteristics
Good wear tolerance and self-healing capacity due to rhizomes. Moderate shade tolerance (prefers sun). Prone to certain diseases like dollar spot, leaf spot, and summer patch under stress. Excellent winter color retention compared to warm-season grasses.
Ecological Information
Introduced species in North America. Provides good soil stabilization and erosion control due to dense root and rhizome network. Offers standard wildlife cover for small animals and insects. Often blended with Perennial Ryegrass and Fine Fescue for resilient northern lawns.