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 to 7; excellent cold tolerance; struggles in extreme southern heat unless heavily irrigated; goes dormant in freezing winters and severe summer droughts
Grass Family
Poaceae, subfamily Pooideae, tribe Poeae
Variety / Cultivar
Various turf-type cultivars (e.g., 'Midnight', 'Baron')
About This Grass
Forms a dense, fine-to-medium textured turf with rich dark green to blue-green color; grows 1.5 to 2.5 feet tall if unmowed, but maintained at 1.5 to 2.5 inches; produces open, pyramid-shaped panicle seed heads at maturity
Blade Characteristics
Medium-fine blades (2-4mm width) with distinctly boat-shaped tips and prominent parallel veins; folded in the bud (vernation); smooth texture with a membranous ligule and absent auricles
Root System
Moderately deep fibrous root system combined with extensive spreading rhizomes; moderate to slow establishment speed; prone to thatch buildup under high maintenance; provides excellent sod strength and wear recovery
Growing Information
Origin Region
Europe and Northern Asia; widely naturalized and cultivated across North America in cool, humid, and transitional zones
Growth Habit
Aggressively rhizomatous, forming a dense, uniform sod with underground spreading stems
Sunlight & Water Needs
Requires full sun (minimum 6-8 hours daily); moderate to high water needs to maintain green color during summer; goes into summer dormancy under drought stress; prefers well-drained, fertile soils with a pH of 6.0 to 7.0
Mowing & Maintenance
Ideal mowing height between 2.0 and 3.0 inches; requires regular mowing during peak spring and fall growth; high fertilization needs (3-5 lbs N per 1000 sq ft annually); periodic dethatching and aeration needed; high maintenance level
Special Characteristics
Excellent wear tolerance and natural self-repairing ability via rhizomes; moderate drought recovery; poor to moderate shade tolerance; susceptible to certain diseases like dollar spot, leaf spot, and summer patch; highly valued for premier lawns and athletic fields
Ecological Information
Introduced species in North America; provides limited wildlife food and cover compared to native prairies; excellent soil stabilization and erosion control due to dense root and rhizome network; frequently blended with Perennial Ryegrass and Tall Fescue