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 3-7, excellent cold tolerance, struggles in extreme summer heat unless irrigated, goes dormant in winter.
Grass Family
Poaceae, subfamily Pooideae, tribe Poeae
Variety / Cultivar
Standard turf-type cultivars (e.g., 'Midnight', 'Bewitched')
About This Grass
Forms a dense, fine to medium-textured turf of dark green to blue-green color. Reaches 18-24 inches if unmowed, but maintained at 1.5-2.5 inches. Produces open, pyramid-shaped panicle seed heads at maturity.
Blade Characteristics
Medium-fine 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
Moderate to deep fibrous root system with extensive underground rhizomes. Forms a very dense sod, medium establishment speed, moderate to high thatch tendency under high fertility.
Growing Information
Origin Region
Europe, Northern Asia, and parts of North America. Well-adapted to northern temperate regions with cold winters and moderate summers.
Growth Habit
Aggressively rhizomatous, forming a dense, uniform, spreading turf mat.
Sunlight & Water Needs
Requires full sun (minimum 6-8 hours daily), moderate to high water needs for optimal appearance, enters summer dormancy during severe drought, prefers well-drained loamy soils with pH 6.0-7.0.
Mowing & Maintenance
Mow at 1.5 to 2.5 inches. Requires regular fertilization (3-4 lbs N/1000 sq ft/year), periodic aeration and dethatching, and high maintenance overall.
Special Characteristics
High wear tolerance and excellent self-repairing ability via rhizomes. Moderate shade tolerance. Prone to certain diseases like dollar spot and leaf spot if mismanaged. Excellent cold and drought recovery.
Ecological Information
Widely naturalized in North America. Provides good soil stabilization and erosion control due to dense sod. Often blended with perennial ryegrass and fine fescues for lawns.