Kentucky Bluegrass
Poa pratensis · Cool-season, Perennial, C3 grass
Grass Family
Poaceae, Subfamily Pooideae, Tribe Poeae
Grass Category
Lawn/Turf Grass
Variety / Cultivar
Likely a common turf-type blend (e.g., 'Midnight' or 'Baron'), though specific cultivar identification from distance photos is limited; displays standard medium-fine texture.
Hardiness Zones
USDA Zones 2-7; excellent cold tolerance; transitions to dormancy (browns) in extreme heat or prolonged drought.
About This Grass
A dense, low-growing turf grass with a dark green to blue-green color. It exhibits a uniform texture and soft feel. When unmowed, it reaches 12-24 inches with open, pyramidal panicle seed heads, but typically maintained as a low mat.
Blade Characteristics
Narrow to medium width (2-4mm), V-shaped or flat blades with a distinctive boat-shaped (keeled) tip. Vernation is folded in the bud; ligule is short and membranous; auricles are absent.
Root System
Relatively shallow to moderate fibrous root system supported by an extensive network of horizontal underground rhizomes. Significant thatch tendency if over-fertilized; slow establishment from seed but high sod-forming ability.
Growing Information
Origin Region
Native to Europe, Northern Asia, and the mountains of Morocco and Algeria; widely naturalized across North America.
Growth Habit
Rhizomatous (spreading underground), forming a dense, uniform sod with excellent recovery capabilities.
Sunlight & Water Needs
Prefers Full Sun (6+ hours) but can tolerate light shade; requires moderate to high watering; enters summer dormancy during severe drought to survive heat stress.
Mowing & Maintenance
Ideal height 2.0-3.5 inches; high maintenance level requiring 2-4 lbs of Nitrogen per 1000 sq ft annually; needs regular aeration to manage thatch buildup.
Special Characteristics
Excellent traffic and wear tolerance due to rhizomes; susceptible to leaf spot, melting out, and necrotic ring spot; high aesthetic value for residential lawns and sports fields.
Ecological Information
Introduced species in North America; provides cover for small insects; highly effective at soil stabilization and erosion control due to dense rhizome mat; often blended with Perennial Ryegrass or Fine Fescue.