Kentucky Bluegrass
Poa pratensis · Cool-season, Perennial, C3 grass
AI-generated identification · may be incorrect
Grass Category
Lawn/Turf Grass, Sports Turf, Erosion Control
Hardiness Zones
USDA Hardiness Zones 3 to 7, excellent cold tolerance, moderate heat tolerance, prone to summer stress in the deep Southern transition zone.
Grass Family
Poaceae, subfamily Pooideae, tribe Poeae
Variety / Cultivar
Common or various blended turf cultivars (e.g., 'Midnight', 'Baron')
About This Grass
Forms a dense, high-quality turf with a medium-fine texture and rich dark green to blue-green color. Mown height typically 1.5 to 2.5 inches, while unmown plants can reach 12 to 24 inches with pyramidal, open panicle seed heads.
Blade Characteristics
Medium-fine width (2-4mm), flat to V-shaped with distinct boat-shaped tips and parallel sides. Vernation is folded in the bud. Ligule is short and membranous; auricles are absent.
Root System
Fibrous and shallow to moderately deep (mostly top 4-6 inches), highly rhizomatous, moderate-to-slow establishment speed, forms a very dense sod with a tendency to build thatch under high maintenance.
Growing Information
Origin Region
Europe and Northern Asia; widely naturalized and cultivated across North America and temperate regions worldwide
Growth Habit
Aggressively rhizomatous, forming a dense, uniform turf mat and sod
Sunlight & Water Needs
Requires full sun (at least 6-8 hours daily), moderate to high water needs for optimal appearance, enters summer dormancy during severe drought, prefers well-drained fertile loamy soils with pH 6.0-7.0.
Mowing & Maintenance
Mow at 2.0 to 3.5 inches, high maintenance level, requires 3-5 lbs N per 1000 sq ft annually, regular irrigation, dethatching, and aeration due to thick thatch accumulation.
Special Characteristics
Good wear tolerance and excellent self-repairing capability via rhizomes, moderate disease susceptibility (leaf spot, dollar spot, summer patch), poor shade tolerance, excellent cold-season color retention.
Ecological Information
Introduced species in North America, provides good soil stabilization and erosion control, wildlife cover and grazing value, frequently blended with perennial ryegrass and fescues in turf seed mixes.