Kentucky Bluegrass
Poa pratensis · Cool-season, Perennial, C3 grass
AI-generated identification · may be incorrect
Grass Category
Lawn/Turf Grass
Hardiness Zones
USDA Hardiness Zones 3-7, excellent cold tolerance, moderate heat tolerance, goes dormant in winter freeze
Grass Family
Poaceae, subfamily Pooideae
Variety / Cultivar
Common blend (such as 'Midnight' or 'Baron')
About This Grass
Forms a dense, high-quality turf with a medium-fine texture and rich green to blue-green color; grows 1 to 2 feet tall if left unmowed but maintained at 2-3 inches; produces open, pyramid-shaped panicle seed heads at maturity
Blade Characteristics
Medium width (2-4mm), flat to folded with distinct parallel veins and characteristic boat-shaped tips; vernation is folded in the bud; ligule is short and membranous; auricles are absent
Root System
Moderately deep fibrous root system with aggressive underground rhizomes; moderate to high thatch tendency; slow to establish from seed but forms an extremely tough, dense sod
Growing Information
Origin Region
Europe and Northern Asia, widely naturalized and cultivated across North America
Growth Habit
Rhizomatous, spreading underground via robust rootstalks to form a dense, uniform turf
Sunlight & Water Needs
Requires full sun (at least 6-8 hours daily), moderate to high watering needs, goes into summer dormancy during severe drought; prefers well-drained, fertile soils with a pH of 6.0-7.0
Mowing & Maintenance
Ideal mowing height is 2.0 to 3.0 inches; high maintenance level requiring regular fertilization (3-4 lbs N per 1000 sq ft/year), frequent mowing, and periodic aeration
Special Characteristics
High wear tolerance and excellent self-repairing capability due to rhizomes; moderate disease and insect susceptibility; poor shade tolerance compared to fescues; excellent drought recovery
Ecological Information
Introduced species in North America; provides standard turf benefits like erosion control, dust suppression, and soil stabilization; frequently mixed with perennial ryegrass and fine fescues in lawn seed blends