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, exhibiting excellent cold tolerance and winter hardiness, but prone to summer stress in hot transition zones.
Grass Family
Poaceae, subfamily Pooideae
Variety / Cultivar
Common turf cultivars (e.g., 'Midnight', 'Baron')
About This Grass
Forms a dense, high-quality turf with a medium-fine texture and a rich dark green to blue-green color. Mown height typically ranges from 1.5 to 2.5 inches, while unmowed growth can reach 18-24 inches with distinctive open, pyramidal panicle seed heads.
Blade Characteristics
Blades are medium width (2-4mm), flat to folded with prominent parallel veins and distinctive boat-shaped tips. Vernation is folded in the bud. Ligules are short and membranous, and auricles are absent.
Root System
Moderately deep fibrous root system combined with aggressive rhizomes. Establishes relatively slowly from seed, but forms a very dense sod with moderate to high thatch-forming tendencies.
Growing Information
Origin Region
Europe and Northern Asia, widely naturalized and cultivated across North America and temperate regions worldwide
Growth Habit
Rhizomatous, spreading extensively via underground stems to form a dense, uniform sod
Sunlight & Water Needs
Requires full sun (at least 6-8 hours daily) with moderate to high water needs. Good cold-induced drought dormancy, but struggles under prolonged high heat and severe drought without irrigation. Prefers well-drained, fertile soils with a pH between 6.0 and 7.0.
Mowing & Maintenance
Maintained at 1.5 to 2.5 inches. Requires moderate to high maintenance, regular fertilization (3-4 lbs N per 1000 sq ft per year), periodic dethatching, and aeration.
Special Characteristics
Excellent self-repairing wear tolerance due to rhizomes, good disease resistance when properly managed, poor shade tolerance, and superior winter color retention compared to warm-season grasses.
Ecological Information
Introduced species in North America, provides excellent erosion control, forms stable sods for turf ecosystems, and is frequently blended with perennial ryegrass and fine fescues.