Kentucky Bluegrass
Poa pratensis · Cool-season, Perennial, C3
Grass Family
Poaceae, Subfamily Pooideae, Tribe Poeae
Grass Category
Lawn/Turf Grass
Variety / Cultivar
Likely a common turf-type blend (e.g., 'Midnight' or 'Kenblue' derivatives based on dark green color and leaf density)
Hardiness Zones
USDA Hardiness Zones 2-7; excellent cold tolerance; poor heat tolerance in deep south; goes dormant in winter freezing or extreme summer heat.
About This Grass
A dense, low-growing turf grass with a dark blue-green hue. Forms a smooth, carpet-like lawn. Unmowed, it reaches 12-24 inches with open, pyramidal panicle seed heads. Texture is medium-fine.
Blade Characteristics
Width is medium (2-4mm); leaves are V-shaped or flat; characteristic 'boat-shaped' leaf tips are present. Vernation is folded in the bud; ligule is very short (0.2-0.6mm) and membranous; auricles are absent.
Root System
Moderately deep fibrous roots supplemented by aggressive rhizomes. High thatch tendency; moderate establishment speed from seed (21+ days); excellent sod-forming and wear recovery due to rhizomes.
Growing Information
Origin Region
Native to Europe, North Asia, and Morocco; naturalized throughout temperate North America and cool-humid climates globally.
Growth Habit
Rhizomatous; spreads via underground creeping stems to form a dense, uniform sod with high regenerative capacity.
Sunlight & Water Needs
Prefers full sun (minimum 6 hours); moderate to high water needs; moderate drought tolerance but tends to go dormant (brown) during heat/drought to survive.
Mowing & Maintenance
Ideal height 2.0 to 3.5 inches; moderate frequency; fertilization 2-4 lbs N/1000 sq ft/year; requires regular aeration and occasional dethatching; Medium-High maintenance level.
Special Characteristics
Excellent wear tolerance and recovery; good disease resistance in modern cultivars; poor shade tolerance; high salt sensitivity; superior winter color compared to warm-season grasses.
Ecological Information
Introduced/Naturalized in US; provides erosion control due to dense rhizomes; host plant for several butterfly larvae (skippers); often used in 'northern mixes' with Fine Fescue and Perennial Ryegrass.