Kentucky Bluegrass
Poa pratensis · Cool-season, Perennial, C3 grass
Grass Family
Poaceae, Subfamily Pooideae
Grass Category
Lawn/Turf Grass
Variety / Cultivar
Common/Mixed Cultivar (Likely part of a sun-shade blend featuring Midnight or Baron-type genetics)
Hardiness Zones
USDA Zones 2-7; excellent cold tolerance; enters winter dormancy; struggles in Humid Subtropical (Zone 8+) without irrigation.
About This Grass
A dense, sod-forming grass with a rich dark green to blue-green color. It maintains a soft texture and medium density. In unmowed states, it produces panicle-type seed heads that are open and pyramidal.
Blade Characteristics
Fine to medium width (2-4mm); folded vernation; distinct boat-shaped tip; smooth surface with a prominent midrib (twin veins); ligule is short and membranous; auricles are absent.
Root System
Moderately deep fibrous root system with extensive horizontal rhizomes; forms a thick, durable sod; high thatch-forming tendency; slow to moderate establishment from seed.
Growing Information
Origin Region
Native to Europe, North Asia, and Northern Africa; well-adapted to Northern US and Canada
Growth Habit
Rhizomatous (spreading underground) and mat-forming
Sunlight & Water Needs
Full sun preferred (6+ hours); moderate shade tolerance; requires consistent moisture (1 inch per week); moderate drought tolerance but will go dormant in extreme heat/dry spells.
Mowing & Maintenance
Ideal height 2.5 to 3.5 inches; high maintenance; requires 2-4 lbs N per 1,000 sq ft per year; periodic dethatching and core aeration recommended.
Special Characteristics
Excellent traffic/wear tolerance due to self-repairing rhizomes; good disease resistance in modern cultivars; highly prized for winter hardiness and aesthetics.
Ecological Information
Introduced/Naturalized in North America; provides cover for small insects; stabilizes soil effectively; frequently blended with Perennial Ryegrass or Fine Fescue for biodiversity.