Kentucky Bluegrass
Poa pratensis · Cool-season, Perennial, C3 grass
AI-generated identification · may be incorrect
Grass Category
Lawn/Turf Grass
Hardiness Zones
Thrives in USDA Hardiness Zones 3 through 7, tolerates cold extremely well, struggles in extreme summer heat unless irrigated.
Grass Family
Poaceae, subfamily Pooideae
Variety / Cultivar
Common blend (such as 'Midnight' or 'Baron')
About This Grass
Dense, fine-to-medium textured turf with an attractive rich green to blue-green color. Grows 1.5 to 2 feet tall if left unmowed, but usually maintained at 2 to 3 inches. Forms open, pyramidal panicle seed heads at maturity.
Blade Characteristics
Medium-fine width (2-4mm), flat to folded shape with characteristic boat-shaped tips. Color ranges from medium green to dark blue-green. Vernation is folded in the bud. Prominent parallel veins with a smooth texture.
Root System
Moderately deep fibrous root system combined with an extensive network of creeping rhizomes. Forms a very dense sod, medium establishment speed, and moderate thatch tendency.
Growing Information
Origin Region
Europe and Northern Asia, widely naturalized and cultivated across North America and temperate regions worldwide
Growth Habit
Rhizomatous, spreading vigorously via underground stems to form a dense, uniform turf mat
Sunlight & Water Needs
Requires full sun (at least 6 hours daily) for optimal growth, though some cultivars offer moderate shade tolerance. High watering needs during dry spells to stay green, goes into summer dormancy if unwatered.
Mowing & Maintenance
Ideal mowing height is 2.0 to 3.0 inches. Medium to high maintenance level requiring regular fertilization (3-4 lbs N per 1000 sq ft per year), periodic aeration, and dethatching.
Special Characteristics
Excellent wear tolerance and self-repairing capabilities due to rhizomes. Good winter color retention in milder cool climates, excellent cold tolerance, moderate disease susceptibility (e.g., leaf spot, dollar spot).
Ecological Information
Introduced species in North America. 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.