Kentucky Bluegrass
Poa pratensis · Cool-season, Perennial, C3 grass
Grass Family
Poaceae, subfamily Pooideae, tribe Poeae
Grass Category
Lawn/Turf Grass, Sports Turf
Variety / Cultivar
ProVista Kentucky Bluegrass
Hardiness Zones
Thrives in USDA Hardiness Zones 3 through 7. Excellent cold tolerance, surviving sub-zero winter temperatures, but enters winter dormancy. Can struggle in extreme summer heat and humidity outside of northern climates or transition zones.
About This Grass
Forms a dense, high-quality turf with a rich medium-to-dark green color. Height ranges from 1.5 to 2.5 inches when maintained, but can reach 18-24 inches if left unmowed, producing open, pyramidal panicle seed heads.
Blade Characteristics
Medium-fine width (2-3 mm), V-shaped or folded in the bud with distinctive boat-shaped tips and parallel sides. Features prominent tramlines (dual parallel translucent lines alongside the midrib). Ligule is short and membranous; auricles are absent.
Root System
Moderately deep fibrous root system combined with aggressive rhizomes. Exhibits a tendency to form thatch under high fertilization and moisture. Slow to establish from seed, but forms an extremely tough, dense sod once mature.
Growing Information
Origin Region
Europe and Northern Asia; widely naturalized and cultivated across North America and temperate regions worldwide
Growth Habit
Rhizomatous, spreading underground via aggressive creeping rootstocks to form a dense, uniform sod
Sunlight & Water Needs
Requires full sun (minimum 6-8 hours daily) for optimal growth, though some cultivars show moderate shade tolerance. High water requirement to maintain color and growth during dry periods; goes dormant (turns brown) during severe drought. Prefers well-drained fertile soils with a pH of 6.0 to 7.0.
Mowing & Maintenance
Ideal mowing height is 2.0 to 3.5 inches. Requires regular weekly mowing during peak growing season. High fertilizer needs (3-4 lbs N per 1000 sq ft annually). Regular dethatching and core aeration are recommended due to heavy thatch accumulation. High maintenance level.
Special Characteristics
Exceptional wear tolerance and self-healing capability due to aggressive rhizomatous spread. Good cold and freezing tolerance. Moderate disease susceptibility (e.g., dollar spot, leaf spot, summer patch). Excellent erosion control and weed suppression due to high turf density.
Ecological Information
Introduced to North America by European settlers. Provides standard lawn ecosystem services including soil stabilization, carbon sequestration, and stormwater runoff reduction. Frequently blended with Perennial Ryegrass and Fine Fescue for turf stability.