Kentucky Bluegrass
Poa pratensis · Cool-season, Perennial, C3 grass
AI-generated identification · may be incorrect
Grass Category
Lawn/Turf Grass
Hardiness Zones
USDA Hardiness Zones 3 to 7; thrives in cool, humid and semi-arid regions.
Grass Family
Poaceae, subfamily Pooideae, tribe Poeae
Variety / Cultivar
Standard turf-type blends (e.g., 'Midnight', 'America')
About This Grass
Forms a dense, medium-textured turf with an upright growth habit. Color is a rich dark green to blue-green. Reaches 18 to 24 inches if left unmowed, but maintained at 1.5 to 2.5 inches. Produces open, pyramidal panicle seed heads at maturity.
Blade Characteristics
Blades are medium in width (2-4mm), flat to folded with distinct parallel veins and a classic boat-shaped tip. Vernation is folded in the bud. Ligule is short and membranous; auricles are absent.
Root System
Moderately deep fibrous root system combined with aggressive rhizomes. Forms a very dense sod, medium establishment speed, and moderate thatch-forming tendency.
Growing Information
Origin Region
Europe, northern Asia, and the mountains of North America; widely cultivated throughout cool-temperate regions worldwide.
Growth Habit
Rhizomatous, spreading underground via robust root stalks to form a dense, uniform turf.
Sunlight & Water Needs
Requires full sun (at least 6-8 hours daily) with moderate to high water needs. Good cold tolerance but goes dormant during severe summer droughts unless irrigated.
Mowing & Maintenance
Mow at 1.5 to 2.5 inches. Requires a medium-to-high maintenance level, including regular fertilization (3-4 lbs N per 1000 sq ft annually), occasional dethatching, and aeration.
Special Characteristics
Excellent wear tolerance and self-healing capabilities due to rhizomes. Good cold tolerance and winter hardiness, but moderate shade and heat tolerance.
Ecological Information
Introduced to North America by European settlers. Used extensively in home lawns, sports fields, and parks for soil stabilization, erosion control, and high-quality turf aesthetics.