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 through 7 (adapts well to northern climates, struggles in extreme southern heat unless heavily irrigated). Excellent cold tolerance; goes dormant and turns straw-colored in freezing winters.
Grass Family
Poaceae, subfamily Pooideae, tribe Poeae
Variety / Cultivar
Common or various blended cultivars like 'Midnight' or 'Bison'
About This Grass
Forms a dense, lush, medium-textured turf with an attractive rich green to blue-green color. Grows 1.5 to 2.5 feet tall if left unmowed, but maintained as a turf at 1.5 to 3 inches. Produces pyramid-shaped panicle seed heads at maturity in late spring.
Blade Characteristics
Fine to medium width (2-4mm), flat to V-shaped with distinct parallel veins, prominent boat-shaped tips. Vernation is folded in the bud. Ligule is short and membranous; auricles are absent.
Root System
Moderately deep fibrous root system combined with aggressive rhizomes. Establishes relatively slowly from seed, but forms a very tough, dense sod once mature that resists heavy traffic and recovers well.
Growing Information
Origin Region
Native to Europe, northern Asia, and parts of the mountains of North America; widely naturalized and cultivated across cool temperate regions globally.
Growth Habit
Aggressively rhizomatous, forming a dense, uniform turf mat with extensive underground spreading.
Sunlight & Water Needs
Requires full sun (minimum 6 hours direct sunlight) for optimal density, though some modern cultivars show moderate shade tolerance. Moderate to high water needs; goes into summer dormancy during severe drought but revives with water. 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. Mowed frequently during peak spring and autumn growth periods. Requires moderate to high maintenance, including 3 to 5 lbs of nitrogen per 1,000 sq ft annually, regular irrigation, and periodic dethatching.
Special Characteristics
Excellent wear and traffic tolerance due to aggressive rhizomatous recovery. Good cold hardiness and winter survival, but susceptible to summer patch, dollar spot, and leaf spot diseases. Moderate drought dormancy capability.
Ecological Information
Introduced species in North America outside of high-altitude native ranges. Provides good erosion control and stable turf cover. Often blended with perennial ryegrass and fine fescues in commercial seed mixes to improve establishment speed and disease resistance.