Kentucky Bluegrass
Poa pratensis · Cool-season, Perennial, C3 grass, widely used in northern regions and the upper transition zone
AI-generated identification · may be incorrect
Grass Category
Lawn/Turf Grass
Hardiness Zones
USDA Hardiness Zones 3 through 7, excellent cold tolerance, moderate heat tolerance, goes into winter dormancy in colder climates, transitions well across northern and upper transition zones.
Grass Family
Poaceae, subfamily Pooideae, tribe Poeae
Variety / Cultivar
Standard lawn blends typically containing modern turf-type cultivars bred for dark green color, disease resistance, and medium-fine texture.
About This Grass
Forms a dense, high-quality turf with a vibrant medium to dark green color. Height ranges from 1.5 to 3 inches when maintained as a lawn, but can grow up to 18-24 inches if left unmowed, producing open, pyramidal panicle seed heads.
Blade Characteristics
Medium-fine texture (2-4 mm wide), flat to folded in the bud with characteristic boat-shaped (prow-like) tips, prominent parallel veins, smooth margins, a short membranous ligule, and absent auricles.
Root System
Moderately deep fibrous root system complemented by an extensive network of underground rhizomes. Forms a very dense sod, medium establishment speed, moderate to high thatch-forming tendency under high fertility.
Growing Information
Origin Region
Native to Europe, northern Asia, and parts of the mountains of North America; widely naturalized and cultivated across cool, temperate regions worldwide.
Growth Habit
Rhizomatous, spreading extensively via underground stems to form a dense, uniform sod and aggressive turf mat.
Sunlight & Water Needs
Performs best in full sun (minimum 6-8 hours daily), requires regular moisture for optimal appearance, moderate drought tolerance (enters summer dormancy during severe dry spells), prefers well-drained, fertile soils with a pH of 6.0-7.0.
Mowing & Maintenance
Maintain mowing height between 2.0 and 3.5 inches. Requires regular mowing, medium-high fertilization (3-4 lbs N per 1000 sq ft annually), periodic dethatching and core aeration, and overseeding as needed. Overall maintenance level is medium to high.
Special Characteristics
Exceptional wear tolerance and self-repairing capabilities due to aggressive rhizomes. Good recovery from traffic and damage, moderate shade tolerance compared to fescues, susceptible to certain diseases like dollar spot and leaf spot under high humidity.
Ecological Information
Introduced species in North America, provides excellent soil stabilization and erosion control, filters runoff water effectively, frequently blended with perennial ryegrass and fine fescues for balanced lawn establishment.