Kentucky Bluegrass
Poa pratensis · Cool-season, Perennial, C3 pathway
Grass Family
Poaceae, subfamily Pooideae, tribe Poeae
Grass Category
Lawn/Turf Grass, Sports Turf, Golf Course Fairways
Variety / Cultivar
Likely a common turf-type blend such as ‘Midnight’ or ‘Baron’; characterized by high tiller density and dark green color.
Hardiness Zones
USDA Zones 2-7; excellent cold tolerance; high heat sensitivity; goes dormant (brown) in summer heat or winter freezes.
About This Grass
A dense, high-quality turf grass reaching 12-24 inches if left unmowed. Displays a deep emerald to blue-green color with a fine-to-medium texture. Seed heads are open, pyramidal panicles, though rarely seen in maintained lawns.
Blade Characteristics
Fine to medium width (2-4mm), V-shaped or flat; distinctive boat-shaped (keeled) leaf tip; dark green color; folded vernation; membranous ligule (0.2-1.0mm); no auricles; smooth collar.
Root System
Moderately deep fibrous root system complemented by extensive rhizomes. High thatch-forming tendency; slow establishment from seed but excellent wear recovery once mature.
Growing Information
Origin Region
Native to Europe, North Asia, and Morocco; widely naturalized and cultivated in temperate regions of North America.
Growth Habit
Rhizomatous (spreading via underground stems), forming a dense, self-repairing sod with aggressive spreading tendencies.
Sunlight & Water Needs
Prefers Full Sun (6+ hours) but can tolerate light shade; high water requirement (1-1.5 inches per week); moderate drought tolerance but enters dormancy to survive extreme heat.
Mowing & Maintenance
Ideal height 2.0-3.5 inches; frequent mowing required during spring/fall peaks; 3-5 lbs N per 1,000 sq ft annually; requires aeration and occasional dethatching; High maintenance.
Special Characteristics
Excellent traffic tolerance and self-healing via rhizomes; susceptible to summer patch, dollar spot, and necrotic ring spot; superior winter hardiness and sod strength.
Ecological Information
Introduced species in North America; provides soil stabilization and high-density water filtration; low wildlife value compared to bunchgrasses; frequently mixed with Perennial Ryegrass or Fine Fescue for genetic diversity.