Kentucky Bluegrass
Poa pratensis · Cool-season, Perennial, C3 grass
AI-generated identification · may be incorrect
Grass Category
Lawn/Turf Grass, Sports Turf
Hardiness Zones
USDA Hardiness Zones 3 through 7 (adapts poorly to the deep south due to extreme summer heat). Excellent cold tolerance; enters winter dormancy.
Grass Family
Poaceae, subfamily Pooideae, tribe Poeae
Variety / Cultivar
Standard or common turf-type blend (e.g., 'Midnight', 'Bewitched')
About This Grass
Forms a dense, high-quality, fine-to-medium textured turf with rich dark-green to blue-green color. Maintained height is typically 2 to 3 inches, while unmoved growth can reach 18 to 24 inches with open, pyramidal panicle seed heads.
Blade Characteristics
Blades are medium in 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
Moderately deep fibrous root system combined with an extensive rhizome network. Forms a very dense sod with moderate thatch-forming tendencies. Slow to establish from seed, but excellent at self-repairing via rhizomes.
Growing Information
Origin Region
Europe, northern Asia, and parts of the mountains of North America; widely naturalized and cultivated in temperate regions worldwide.
Growth Habit
Rhizomatous, spreading underground via robust rhizomes to form a dense, uniform turf mat.
Sunlight & Water Needs
Requires full sun (at least 6-8 hours of direct sunlight) for optimal performance. Moderate to high water needs; enters dormancy during prolonged severe drought and recovers upon receiving moisture. Prefers well-drained fertile loam 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, moderate to high fertilization (3-5 lbs N per 1000 sq ft per year), periodic core aeration, and dethatching. Maintenance level is high.
Special Characteristics
Exceptional wear tolerance and self-repair capability due to rhizomes. Good cold tolerance, moderate heat stress tolerance, poor shade tolerance compared to fescues. Recovers well from traffic damage.
Ecological Information
Introduced species in North America. Provides good soil stabilization and turf utility. Frequently blended with Perennial Ryegrass and Fine Fescues in northern lawn seed mixes to improve establishment speed and disease resilience.