Kentucky Bluegrass
Poa pratensis · Cool-season (C3), Perennial
Grass Family
Poaceae, Subfamily Pooideae, Tribe Poeae
Grass Category
Lawn/Turf Grass, Sports Turf, Golf Course Grass (Fairways/Tees)
Variety / Cultivar
Likely a common turf-type variety such as 'Midnight' or 'Kenblue' (Specific cultivar identification requires genetic testing, but density suggests a modern turf hybrid)
Hardiness Zones
USDA Zones 2-7; Excellent cold tolerance; struggles in the hot, humid South (Zone 8+). Enters winter dormancy in freezing temperatures.
About This Grass
A high-quality, dense turfgrass with a soft texture. It forms a lush, uniform carpet that recovers well from traffic. In unmowed states, it reaches 12-24 inches with open, airy panicle seed heads. Color ranges from medium to dark blue-green.
Blade Characteristics
Blade width: 1.5-3.5mm (Medium). Shape: Flat or slightly V-shaped. Tip: Distinctive boat-shaped (keeled) tip. Color: Deep blue-green. Vernation: Folded in the bud. Ligule: Short, membranous, and truncated. Auricles: Absent. Collar: Narrow to medium width.
Root System
Moderately deep fibrous root system with extensive horizontal rhizomes. High thatch tendency due to organic matter accumulation. Moderate establishment speed compared to ryegrass.
Growing Information
Origin Region
Native to Europe and parts of Asia; widely naturalized in North America and temperate regions worldwide
Growth Habit
Rhizomatous (spreading via underground stems), forming a dense, self-repairing sod mat
Sunlight & Water Needs
Full Sun preferred (minimum 6-8 hours); poor in dense shade. High water needs (1-1.5 inches per week). Moderate drought tolerance via dormancy; will go brown/dormant to survive heat but recovers with water.
Mowing & Maintenance
Ideal height: 1.5 to 3 inches. High maintenance: Requires 2-4 lbs Nitrogen per 1000 sq ft annually. Needs regular aeration and occasional dethatching. High frequency mowing during spring/fall peaks.
Special Characteristics
Exceptional wear tolerance and self-healing ability via rhizomes. Moderate disease resistance to leaf spot but susceptible to summer patch and necrotic ring spot. Highly prized for visual aesthetics.
Ecological Information
Introduced/Naturalized in North America. Provides significant erosion control due to dense rhizome network. High value for urban cooling and water filtration in managed landscapes. Common in high-quality grass seed mixes with Perennial Ryegrass and Fine Fescue.