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 to 7, exhibits excellent cold tolerance but struggles in extreme southern heat unless irrigated.
Grass Family
Poaceae, subfamily Pooideae, tribe Poeae
Variety / Cultivar
Standard lawn blend cultivars (e.g., 'Midnight', 'Bewitched')
About This Grass
Forms a dense, high-quality turf with fine to medium texture and rich dark green to blue-green color. Matures up to 18-24 inches if left unmowed, but maintained at 1.5-2.5 inches. Produces open, pyramidal panicle seed heads in late spring.
Blade Characteristics
Fine to medium width (2-4mm), flat to folded with distinct parallel veins, distinctive boat-shaped tips. 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 network of slender rhizomes. Forms a very dense sod, moderate establishment speed from seed, and has a tendency to develop thatch over time.
Growing Information
Origin Region
Europe and northern Asia, widely naturalized and cultivated across North America and temperate regions globally.
Growth Habit
Rhizomatous, spreading extensively via underground stems to form a dense, uniform turf sod.
Sunlight & Water Needs
Requires full sun (minimum 6 hours daily), moderate to high water needs for optimal appearance, enters summer dormancy during severe drought, prefers well-drained fertile soils with a pH of 6.0 to 7.0.
Mowing & Maintenance
Ideal mowing height is 1.5 to 2.5 inches. Requires regular mowing, medium to high fertilization (3-4 lbs N per 1000 sq ft per year), periodic dethatching and core aeration, and high overall maintenance.
Special Characteristics
Excellent traffic and wear tolerance due to aggressive rhizome repair, good winter color retention in milder cool regions, moderate shade tolerance, superior sod-forming ability.
Ecological Information
Introduced species in North America, provides good soil stabilization and erosion control, widely used in grass seed blends with perennial ryegrass and fescues.