Kentucky Bluegrass
Poa pratensis · Cool-season, Perennial, C3
Grass Family
Poaceae, Subfamily Pooideae, Tribe Poeae
Grass Category
Lawn/Turf Grass and Pasture Grass
Variety / Cultivar
Common-type (potential 'Midnight' or 'KBG' blend based on blade color)
Hardiness Zones
USDA Zones 2-7; excellent cold tolerance; poor heat tolerance in the Deep South; goes dormant in winter/extreme summer.
About This Grass
A medium-textured grass with a soft feel; displays a distinct deep emerald to blue-green color. Forms a thick, uniform carpet when maintained, or reaches 12-24 inches when unmowed. Features 'boat-shaped' leaf tips.
Blade Characteristics
Width: 2-4mm (medium); Shape: V-shaped or flat; Tip: Boat-shaped; Vernation: Folded in the bud; Ligule: Short, membranous; Auricles: Absent; Color: Deep green to bluish-green.
Root System
Moderately deep fibrous root system with extensive horizontal rhizomes; forms thick thatch; slow to establish from seed compared to ryegrass.
Growing Information
Origin Region
Native to Europe and Northern Asia; well-adapted to Northern US and Canada
Growth Habit
Rhizomatous (spreading underground via rhizomes), forming a dense sod mat
Sunlight & Water Needs
Preferred Full Sun (minimum 6 hours); moderate shade tolerance. High water needs; enters dormancy during severe drought to survive summer heat.
Mowing & Maintenance
Height: 2.0-3.5 inches; Frequency: Weekly; Fertilization: 2-4 lbs N per 1000 sq ft annually; Aeration recommended due to thatch buildup.
Special Characteristics
Excellent wear recovery due to rhizomes; high turf quality; susceptible to Dollar Spot and Necrotic Ring Spot; low salt tolerance.
Ecological Information
Introduced/Naturalized in North America; provides forage for livestock and wildlife; high soil stabilization value; standard companion for Perennial Ryegrass.