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 to 7. Excellent cold tolerance, survives harsh winters, but struggles with extreme summer heat unless irrigated.
Grass Family
Poaceae, subfamily Pooideae, tribe Poeae
Variety / Cultivar
Common or mixed turf cultivars (e.g., 'Midnight', 'Bewitched')
About This Grass
Forms a dense, high-quality turf with a fine to medium texture and a vibrant medium to dark green or blue-green color. Reaches up to 18-24 inches if unmowed, but maintained turf is kept low. Exhibits good winter hardiness, going dormant during periods of extreme cold or drought.
Blade Characteristics
Blades are medium width (2-4mm), flat to folded with prominent parallel veins and a distinctive boat-shaped tip. 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. Forms a dense sod that resists wear and aids in quick recovery, though establishment from seed is slow. Moderate to high thatch-forming tendency.
Growing Information
Origin Region
Europe and Northern Asia; widely naturalized and cultivated across North America and temperate regions worldwide. Performs best in northern temperate climates.
Growth Habit
Rhizomatous, spreading extensively via underground stems to form a dense, uniform turf mat.
Sunlight & Water Needs
Requires full sun (at least 6-8 hours daily) for optimal growth, with poor shade tolerance. Moderate to high watering needs; goes into summer dormancy under severe drought but recovers well when moisture returns. Prefers well-drained, fertile soils with a pH of 6.0 to 7.0.
Mowing & Maintenance
Mow at 2.0 to 3.5 inches. Requires regular mowing during peak growth seasons. High maintenance level, needing regular fertilization (3-4 lbs N per 1000 sq ft per year), periodic aeration, and dethatching.
Special Characteristics
High wear and traffic tolerance due to self-repairing rhizomes. Moderate to good disease and pest resistance depending on the cultivar. Excellent erosion control due to dense sod formation. Poor shade tolerance.
Ecological Information
Introduced species in North America. Provides good soil stabilization, runoff reduction, and erosion control. Often blended with Perennial Ryegrass and Tall Fescue in seed mixes to improve turf resilience and establishment speed.