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 through 7 (performs exceptionally well in northern climates and the upper transition zone). Excellent cold hardiness, survives severe winters under snow cover.
Grass Family
Poaceae, subfamily Pooideae, tribe Poeae
Variety / Cultivar
Midnight (known for dark blue-green color and high density)
About This Grass
Forms a dense, high-quality turf with a rich medium-to-dark green color. Height ranges from 1.5 to 2.5 inches when maintained, and up to 18-24 inches if left unmowed with open, pyramidal panicle seed heads at maturity.
Blade Characteristics
Medium-fine width (2-4 mm), folded in the bud (vernation), with distinctive boat-shaped tips and parallel sides. Features prominent parallel veins. Ligule is short and membranous; auricles are absent.
Root System
Moderately deep fibrous root system combined with vigorous rhizomes. Tends to build thatch moderately under high management. Establishes slowly from seed, but forms an extremely tough, wear-resistant sod once mature.
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 to partial shade (minimum 4-6 hours of direct sunlight). Moderate to high watering needs for optimal green appearance; enters summer dormancy during prolonged droughts. 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 spring/fall growth. High maintenance level: benefits from 3-5 lbs N per 1000 sq ft per year, regular aeration, and moderate dethatching.
Special Characteristics
High traffic and wear tolerance due to aggressive rhizomatous recovery, good cold tolerance, excellent self-repairing capability, moderate disease resistance (susceptible to dollar spot and leaf spot under stress).
Ecological Information
Introduced species in North America. Provides good soil stabilization and erosion control via dense root/rhizome matrix. Commonly blended with Perennial Ryegrass and Fine Fescues in northern turf seed mixes.