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
Thrives in USDA Hardiness Zones 3 through 7; exhibits excellent cold tolerance, going dormant and turning brown during severe winters or extreme summer heat/drought
Grass Family
Poaceae, subfamily Pooideae
Variety / Cultivar
Midnight (known for dark blue-green color and dense growth)
About This Grass
Forms a dense, fine to medium-textured turf with an attractive medium to dark blue-green color; grows 1.5 to 2.5 feet tall if unmowed, but maintained at 1.5 to 3 inches; produces open, pyramidal panicle seed heads at maturity
Blade Characteristics
Blades are medium-fine (2-4mm wide), flat to folded with prominent parallel veins and distinctive 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 extensive underground rhizomes; moderate establishment speed; forms a very tough, dense sod with a moderate tendency to produce thatch under high nitrogen fertility
Growing Information
Origin Region
Europe, northern Asia, and the mountains of North America; widely naturalized and cultivated across cool-temperate regions worldwide
Growth Habit
Aggressively rhizomatous, spreading via underground stems to form a dense, uniform turf mat
Sunlight & Water Needs
Requires full sun (minimum 6-8 hours of direct sunlight) for best performance, with limited shade tolerance; high watering needs during dry spells to prevent summer dormancy; 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; high maintenance level requiring regular mowing, frequent fertilization (3-5 lbs N per 1000 sq ft annually), periodic aeration, and dethatching
Special Characteristics
Good wear tolerance and excellent self-repair capabilities due to rhizomes; susceptible to certain diseases like dollar spot, leaf spot, and summer patch; moderate drought recovery through underground rhizomes; excellent erosion control
Ecological Information
Introduced in North America by European settlers; provides basic ground cover and soil stabilization; commonly blended with perennial ryegrass and fine fescues for home lawns and sports fields