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, goes dormant and turns brown under prolonged extreme summer heat or drought.
Grass Family
Poaceae, subfamily Pooideae
Variety / Cultivar
General species profile (commonly cultivars like 'Midnight' or 'Baron')
About This Grass
Forms a lush, dense, highly uniform turf with a vibrant medium to dark green color. Height ranges from 1.5 to 2.5 inches when maintained, and can grow up to 18-24 inches if left unmowed. Produces open, pyramid-shaped panicle seed heads at maturity.
Blade Characteristics
Medium width (2-4mm), flat to folded shape with distinct boat-shaped tips and parallel veins. Vernation is folded in the bud. Features a short membranous ligule with no auricles.
Root System
Moderate depth fibrous root system with extensive underground rhizomes. Moderate thatch-forming tendency, slow to medium establishment speed from seed, excellent self-repairing capabilities via rhizomes.
Growing Information
Origin Region
Europe, northern Asia, and the mountains of the western North America
Growth Habit
Rhizomatous, spreading underground via aggressive creeping rootstocks to form a dense turf
Sunlight & Water Needs
Requires full sun (minimum 6-8 hours daily), high water requirements to maintain green color during summer, moderate drought dormancy tolerance, 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 growth seasons. High fertilization needs (3-4 lbs N per 1000 sq ft annually). Regular aeration and occasional dethatching needed. High maintenance level.
Special Characteristics
Good traffic and wear tolerance due to aggressive rhizomatous recovery, moderate shade tolerance compared to fine fescues, susceptible to summer patch and dollar spot diseases.
Ecological Information
Widely introduced and naturalized across North America, provides good soil stabilization and erosion control, commonly blended with Perennial Ryegrass and Tall Fescue in seed mixes.