Kentucky Bluegrass
Poa pratensis · Cool-season, Perennial, C3 grass
AI-generated identification · may be incorrect
Grass Category
Lawn/Turf Grass, Sports Turf, Golf Course Fairways
Hardiness Zones
USDA Hardiness Zones 3 to 7 (performs exceptionally well in northern climates, struggles in extreme southern heat unless heavily irrigated). Goes into summer dormancy during extended drought and heat.
Grass Family
Poaceae, subfamily Pooideae, tribe Poeae
Variety / Cultivar
Common blend (such as 'Midnight' or 'America' types)
About This Grass
Forms a dense, high-quality turf with medium-fine texture and rich dark green to blue-green color. Mows cleanly and maintains density well. Unmowed height reaches 18 to 24 inches with open, pyramidal panicle seed heads.
Blade Characteristics
Fine to medium width (2-4mm), flat to folded with distinct parallel veins and characteristic boat-shaped tips. Vernation is folded in the bud. Ligule is short and membranous, auricles are absent, and the collar is broad and continuous.
Root System
Moderately deep fibrous root system combined with extensive branching rhizomes. Forms a very tough, dense sod. Moderate thatch-forming tendency under high fertility and watering.
Growing Information
Origin Region
Europe and Northern Asia; widely naturalized and cultivated across North America and temperate regions worldwide.
Growth Habit
Rhizomatous, spreading underground via aggressive creeping rhizomes to form a dense, uniform turf mat.
Sunlight & Water Needs
Requires full sun (minimum 6 hours of direct sunlight) for best performance, though some cultivars offer moderate shade tolerance. High watering needs during summer to prevent 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. Requires frequent mowing during peak spring/fall growth. High fertilizer needs (3-5 lbs N per 1000 sq ft per year). Regular aeration and dethatching are beneficial. High maintenance level.
Special Characteristics
Excellent wear tolerance and superior self-repairing capability due to aggressive rhizomes. Moderate cold and disease resistance, poor shade tolerance compared to fine fescues, excellent drought recovery.
Ecological Information
Introduced species in North America. Provides good soil stabilization and erosion control due to dense root and rhizome matrix. Commonly blended with Perennial Ryegrass and Tall Fescue in northern turf mixtures.