Kentucky Bluegrass
Poa pratensis · Cool-season, Perennial, C3 grass
AI-generated identification · may be incorrect
Grass Category
Lawn/Turf Grass
Hardiness Zones
Thrives in USDA Hardiness Zones 3 through 7. Excellent cold tolerance, but struggles with extreme summer heat and humidity in the deep southern US.
Grass Family
Poaceae, subfamily Pooideae, tribe Poeae
Variety / Cultivar
Various lawn cultivars (e.g., 'Midnight', 'Baron')
About This Grass
Forms a lush, dense, dark green to medium green turf with a fine to medium texture. Mows cleanly and achieves high density. Unmowed height reaches 18 to 24 inches with open, pyramidal panicle seed heads.
Blade Characteristics
Blades are medium-fine (2-4mm wide), flat to folded, with characteristic boat-shaped tips. Vernation is folded in the bud. Ligule is short and membranous, auricles are absent.
Root System
Moderate depth (6-12 inches) fibrous root system with aggressive underground rhizomes. Forms a very tough, dense sod. Slow to establish from seed, moderate thatch-forming tendency.
Growing Information
Origin Region
Europe and northern Asia; widely naturalized and cultivated across North America
Growth Habit
Rhizomatous, spreading extensively via underground stems to form a dense, uniform turf
Sunlight & Water Needs
Requires full sun (minimum 6 hours daily) for best performance, though some shade tolerance exists. Moderate to high water needs; enters summer dormancy during severe drought.
Mowing & Maintenance
Ideal mowing height is 2.0 to 3.0 inches. Requires regular mowing, medium-high fertilization (3-4 lbs N per 1000 sq ft annually), and periodic aeration. High maintenance level.
Special Characteristics
Exceptional wear tolerance and self-healing capacity due to rhizomatous growth. Good winter color retention in cooler climates; excellent choice for residential lawns and sports fields.
Ecological Information
Introduced species in North America. Provides moderate wildlife value and excellent soil stabilization/erosion control due to its dense network of roots and rhizomes.