Kentucky Bluegrass
Poa pratensis · Cool-season, Perennial, C3 grass
AI-generated identification · may be incorrect
Grass Category
Lawn/Turf Grass, Sports Turf
Hardiness Zones
Thrives in USDA Hardiness Zones 3 through 7, highly cold-tolerant, struggles in extreme southern heat unless heavily irrigated.
Grass Family
Poaceae, subfamily Pooideae
Variety / Cultivar
Midnight (known for dark blue-green color and excellent disease resistance)
About This Grass
Forms a dense, high-quality turf with a medium-fine texture and rich blue-green to dark green color. Maintained height is typically 1.5 to 2.5 inches, while unmowed it can reach 18 to 24 inches with open, pyramidal panicle seed heads.
Blade Characteristics
Blades are medium width (2-4mm), V-shaped or folded in the bud with distinctive boat-shaped tips, prominent parallel veins, and a smooth texture. Features a short membranous ligule and lacks auricles.
Root System
Moderate depth fibrous root system with extensive aggressive rhizomes. Forms a very dense sod, moderates to high thatch-forming tendency, slow to germinate and establish from seed.
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 robust underground stems to form a dense, uniform turf
Sunlight & Water Needs
Requires full sun (minimum 6-8 hours daily) for optimal growth, moderate to high water needs during dry spells, good winter cold tolerance but enters dormancy during severe summer drought.
Mowing & Maintenance
Ideal mowing height between 2.0 to 3.0 inches. Medium to high maintenance level requiring regular fertilization (3-4 lbs N/1000 sq ft/year), frequent mowing, and periodic dethatching and aeration.
Special Characteristics
Exceptional self-repairing capability via rhizomes yielding high traffic and wear tolerance, good winter color retention in cooler zones, moderate shade tolerance, highly susceptible to summer patch and leaf spot if unmanaged.
Ecological Information
Introduced species in North America, provides basic urban wildlife cover and soil stabilization, highly effective at reducing erosion and filtering runoff in dense turf applications.