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, enters dormancy during severe summer heat or drought.
Grass Family
Poaceae, subfamily Pooideae
Variety / Cultivar
Common blend, e.g., 'Midnight' or 'Baron'
About This Grass
Forms a very dense, fine to medium-textured turf with a rich dark green to blue-green color. Mowed height is typically 1.5 to 2.5 inches, while unmowed can reach 18 to 24 inches with open, pyramidal panicle seed heads.
Blade Characteristics
Blades are medium-narrow (2-4mm), flat to folded with distinct boat-shaped tips and prominent parallel veins. Vernation is folded in the bud. Ligule is short and membranous; auricles are absent.
Root System
Moderately deep fibrous root system with extensive branching rhizomes. High thatch-forming tendency under high fertility and moisture. Medium-slow establishment speed from seed.
Growing Information
Origin Region
Europe and Northern Asia; widely cultivated throughout the northern United States and Canada
Growth Habit
Rhizomatous, spreading underground via aggressive horizontal shoots to form a dense sod
Sunlight & Water Needs
Requires full sun (minimum 6-8 hours daily), moderate to high watering needs, excellent cold drought dormancy recovery, prefers well-drained fertile loam with pH 6.0 to 7.0.
Mowing & Maintenance
Mowing height 1.5 to 2.5 inches. High maintenance level requiring regular fertilization (3-4 lbs N per 1000 sq ft per year), frequent watering, and periodic dethatching/aeration.
Special Characteristics
Exceptional self-repairing wear tolerance due to rhizomes, moderate disease susceptibility (dollar spot, leaf spot), poor shade tolerance, and excellent winter color retention in milder cool regions.
Ecological Information
Introduced species in North America, high utility for urban and suburban green spaces, provides soil stabilization, often blended with Perennial Ryegrass and Fine Fescues.