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
Thrives in USDA Hardiness Zones 3 through 7; excellent cold tolerance, moderate heat tolerance; often combined in transition zone mixes.
Grass Family
Poaceae, subfamily Pooideae, tribe Poeae
Variety / Cultivar
'Midnight' (known for its deep blue-green color, dense growth, and good disease resistance)
About This Grass
Forms a dense, high-quality turf with a fine to medium texture and a rich medium to dark blue-green color. Reaches up to 18-24 inches if unmowed, but maintained at 1.5 to 2.5 inches. Produces open, pyramid-shaped panicle seed heads at maturity.
Blade Characteristics
Blades are medium width (2-4mm), flat to folded with prominent parallel veins and distinctive boat-shaped tips. Vernation is folded in the bud. Ligule is short and membranous, auricles are absent, and the collar is broad and continuous.
Root System
Moderately deep fibrous root system combined with extensive rhizomes. Tends to build a moderate thatch layer over time. Slow to germinate and establish from seed, but forms a tough, wear-recoverable dense sod once mature.
Growing Information
Origin Region
Native to Europe and northern Asia; widely naturalized and cultivated across North America and temperate regions worldwide
Growth Habit
Aggressively rhizomatous, forming a dense sod and tight turf mat via underground creeping stems
Sunlight & Water Needs
Requires full sun (minimum 6 hours of direct sunlight) for optimal performance; moderate to high water needs; goes into summer dormancy under severe drought conditions; prefers well-drained, fertile soils with a pH of 6.0-7.0.
Mowing & Maintenance
Ideal mowing height is 1.5 to 2.5 inches. Requires regular mowing during active spring and fall growth. High fertilizer requirement (3-4 lbs N per 1000 sq ft annually). Needs periodic aeration and dethatching; considered a high-maintenance lawn grass.
Special Characteristics
High wear and traffic tolerance with excellent self-repairing capabilities due to rhizomes. Moderate shade tolerance compared to fine fescues. Susceptible to certain diseases like dollar spot, summer patch, and leaf spot under stress.
Ecological Information
Introduced species in North America. Provides good soil stabilization and erosion control due to its dense root and rhizome network. Commonly blended with Perennial Ryegrass and Fine Fescues in northern lawn seed mixtures.