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; excellent cold tolerance, enters semi-dormancy during extreme summer heat; performs exceptionally well in northern temperate climates
Grass Family
Poaceae, subfamily Pooideae
Variety / Cultivar
Standard common type, not specific to a single named cultivar
About This Grass
Forms a dense, fine to medium-textured turf with an attractive dark to medium blue-green color; grows 1.5 to 2.5 feet tall if unmowed, but maintained at 1.5 to 3 inches in lawns
Blade Characteristics
Medium-fine width (2-3mm), flat to V-shaped blades with characteristic boat-shaped tips and parallel veins; folded in the bud (vernation); membranous ligule with no auricles
Root System
Moderately deep fibrous root system with extensive aggressive rhizomes; establishes somewhat slowly from seed but forms a tough, tight sod that recovers well from wear
Growing Information
Origin Region
Europe, northern Asia, and parts of the mountains in North America; widely naturalized and cultivated globally in temperate regions
Growth Habit
Rhizomatous, spreading underground via extensive root-like stems to form a dense, uniform turf mat
Sunlight & Water Needs
Requires full sun (minimum 6 hours daily) for optimal health, though some cultivars tolerate partial shade; high water needs during hot dry spells; moderate drought dormancy; prefers well-drained fertile soils with a pH of 6.0 to 7.0
Mowing & Maintenance
Mow at 2.0 to 3.5 inches every 5-7 days during peak growth; medium to high fertilizer requirement (3-5 lbs N per 1000 sq ft annually); regular dethatching and aeration needed due to dense sod and thatch accumulation
Special Characteristics
Good traffic and wear tolerance due to rhizomatous spreading; moderate to good disease resistance depending on cultivar; excellent turf density that naturally suppresses many weeds; poor shade tolerance compared to fescues
Ecological Information
Introduced to North America by European settlers; provides turf stabilization and reduces soil erosion; heavily used in residential lawns, athletic fields, and parks; often blended with perennial ryegrass and fescues