Kentucky Bluegrass
Poa pratensis · Cool-season, Perennial, C3 grass
Grass Family
Poaceae, Subfamily Pooideae, Tribe Poeae
Grass Category
Lawn/Turf Grass, Sports Turf, Pasture, Golf Course Grass
Variety / Cultivar
Common or unknown cultivar (representative of young, sparse growth in sandy soil)
Hardiness Zones
USDA Zones 2-7. Excellent cold tolerance. It goes dormant (brown) during hot, dry summers or extreme winter cold.
About This Grass
A medium-textured, cool-season grass known for its dark green to blue-green color. In the provided image, the grass is in an early establishment phase, showing sparse vertical shoots with narrow blades. At maturity, it forms a soft, lush carpet. Seed heads are open, airy panicles (pyramidal shape) when allowed to reach maturity.
Blade Characteristics
Blade width is medium (2-4mm). The most distinguishing feature is the boat-shaped (V-shaped) leaf tip. Vernation is folded in the bud; ligule is very short and membranous; auricles are absent. The leaf surface is smooth with a prominent midrib (twin lines).
Root System
Moderately deep fibrous root system complemented by an extensive network of rhizomes. It is known for high thatch-forming tendencies and excellent sod-forming capability which aids in wear recovery.
Growing Information
Origin Region
Native to Europe, North Asia, and the mountains of Morocco and Algeria; naturalized throughout North America in temperate climates.
Growth Habit
Rhizomatous (spreading via underground stems). It forms a dense, thick sod over time but appears as individual sprigs during early establishment.
Sunlight & Water Needs
Prefers Full Sun (6+ hours) but can tolerate light shade. High water needs; requires consistent moisture to stay green during summer heat. Best in well-drained, fertile soils with a pH of 6.0 to 7.0.
Mowing & Maintenance
Ideal height is 2.0 to 3.5 inches. High maintenance requirements including 3-5 lbs of Nitrogen per 1000 sq ft annually. Regular aeration is needed due to thatch buildup.
Special Characteristics
Excellent wear tolerance and recovery due to rhizomes. Good disease resistance in modern cultivars, though susceptible to summer patch and necrotic ring spot. Poor salt tolerance compared to ryegrass.
Ecological Information
Introduced and naturalized in North America. Provides habitat for small mammals and birds. Highly effective for soil stabilization when fully established. Often paired with Perennial Ryegrass or Fine Fescue in seed mixes.