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
USDA Hardiness Zones 3 through 7, highly cold tolerant, goes dormant in extreme heat, performs well in northern regions and parts of the upper transition zone.
Grass Family
Poaceae, subfamily Pooideae, tribe Poeae
Variety / Cultivar
General species type, frequently blended with improved cultivars like 'Midnight' or 'America'
About This Grass
Forms a dense, high-quality turf with a vibrant medium-to-dark green or blue-green color. Reaches up to 18-24 inches if unmowed, but maintained as low as 1.5 to 2.5 inches. Features panicle seed heads at maturity in late spring.
Blade Characteristics
Fine to medium width (2-3mm), flat to folded with prominent parallel veins and a distinctive boat-shaped (prow-shaped) tip. Vernation is folded in the bud. Ligule is short and membranous, auricles absent.
Root System
Moderate root depth (typically 6-12 inches) with an extensive fibrous and rhizomatous network. Forms a very strong, dense sod. Moderate establishment speed, prone to thatch buildup under high fertilization.
Growing Information
Origin Region
Native to Europe, northern Asia, and parts of the mountains of North America; widely naturalized and cultivated across cool-temperate regions worldwide
Growth Habit
Rhizomatous, spreading extensively via underground stems to form a dense, uniform turf mat
Sunlight & Water Needs
Requires full sun (minimum 6-8 hours daily) for optimal performance; moderate to high water needs; enters dormancy during severe drought and recovers when moisture returns. Prefers well-drained, fertile soils with a pH of 6.0 to 7.0.
Mowing & Maintenance
Ideal mowing height ranges from 2.0 to 3.5 inches. Requires regular mowing during peak growth, moderate-to-high fertilization (3-4 lbs N per 1000 sq ft annually), regular aeration and dethatching, and high maintenance level.
Special Characteristics
Excellent wear tolerance and self-healing ability due to rhizomes, good winter color retention in milder cool zones, moderate disease susceptibility (e.g., dollar spot, leaf spot), poor shade tolerance compared to fescues.
Ecological Information
Introduced to North America by early settlers; provides good soil stabilization and erosion control due to dense root and rhizome matrix; frequently mixed with Perennial Ryegrass and Tall Fescue in northern turf seed blends.