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 to 7; excellent cold tolerance down to extreme sub-zero temperatures; struggles in extreme southern heat unless heavily irrigated
Grass Family
Poaceae, subfamily Pooideae, tribe Poeae
Variety / Cultivar
General species type, frequently blended with improved cultivars like 'Midnight' or 'Baron'
About This Grass
Forms a dense, lush, medium-fine textured turf with an attractive rich green to dark blue-green color; grows 18 to 24 inches tall if unmoved, but maintained at 1.5 to 2.5 inches; produces pyramidal panicle seed heads at maturity
Blade Characteristics
Medium-fine blades (2-4mm wide) with distinctive boat-shaped tips, prominent parallel veins creating a railroad-track appearance, folded vernation in the bud, and a short membranous ligule with no auricles
Root System
Moderately deep fibrous root system combined with strong underground rhizomes; moderate establishment speed, forms a thick, high-strength sod, with a medium tendency to develop thatch under high maintenance
Growing Information
Origin Region
Native to Europe, northern Asia, and mountainous regions of North America; widely cultivated across cool temperate regions worldwide
Growth Habit
Rhizomatous, spreading extensively via aggressive underground horizontal stems to form a dense, uniform turf
Sunlight & Water Needs
Requires full sun (at least 6 hours daily) for optimal growth, though some cultivars tolerate partial shade; moderate to high water needs; goes into summer dormancy during severe drought but recovers well
Mowing & Maintenance
Ideal mowing height between 1.5 and 2.5 inches; requires regular weekly mowing during peak growth, moderate to high fertilizer needs (3-4 lbs N per 1000 sq ft per year), and periodic dethatching/aeration; medium-high maintenance level
Special Characteristics
Excellent wear tolerance and self-healing ability due to rhizomes; fair to moderate shade tolerance; good drought recovery through underground dormancy; susceptible to diseases like dollar spot and leaf spot under stress; widely used for home lawns and sports fields
Ecological Information
Introduced species in North America; high value for soil stabilization and erosion control; commonly blended with Perennial Ryegrass and Fine Fescue; provides standard turf cover and moderate urban ecosystem benefits