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 through 7; thrives in northern temperate climates with cold winters and moderate summers.
Grass Family
Poaceae, subfamily Pooideae, tribe Poeae
Variety / Cultivar
Standard turf-type blends (e.g., 'Midnight', 'Compact')
About This Grass
A classic fine-to-medium textured turfgrass with a rich dark green to blue-green color. Forms a dense, high-quality sod. Height ranges from 1.5 to 2.5 inches when maintained, and up to 18-24 inches if left unmowed with open, pyramidal panicle seed heads.
Blade Characteristics
Blades are medium width (2-4mm), flat to folded with prominent parallel veins and characteristic boat-shaped tips. Vernation is folded in the bud. Ligule is short and membranous, and auricles are absent.
Root System
Moderate to deep fibrous root system with aggressive underground rhizomes. High tendency to form thatch if over-fertilized. Slow to establish from seed, but provides excellent sod strength and recovery once mature.
Growing Information
Origin Region
Europe and Northern Asia; widely naturalized and cultivated across North America and temperate regions worldwide.
Growth Habit
Rhizomatous, spreading extensively via underground stems to form a dense, uniform turf mat.
Sunlight & Water Needs
Requires full sun (minimum 6 hours direct sunlight) with moderate to high water needs. Good cold-induced winter dormancy but goes dormant during severe summer heat and drought.
Mowing & Maintenance
Maintain mowing height between 2.0 to 3.0 inches. Medium to high maintenance level requiring regular fertilization (3-4 lbs N per 1000 sq ft annually), periodic aeration, and dethatching.
Special Characteristics
Excellent wear tolerance and self-repairing via rhizomes. Moderate shade tolerance. Prone to certain diseases like dollar spot and leaf spot under stress, but forms an exceptional wear-resistant lawn.
Ecological Information
Introduced species in North America. Provides good soil stabilization and erosion control due to dense rhizomatous root network. Frequently blended with Perennial Ryegrass and Fine Fescue.