Kentucky Bluegrass
Poa pratensis · Cool-season, Perennial, C3 grass
AI-generated identification · may be incorrect
Grass Category
Lawn/Turf Grass, Sports Turf, Golf Course Grass
Hardiness Zones
USDA Hardiness Zones 3 through 7, highly cold tolerant, goes into winter dormancy during freezing periods, struggles in extreme summer heat unless irrigated.
Grass Family
Poaceae, subfamily Pooideae, tribe Poeae
Variety / Cultivar
Common types include 'Midnight', 'Baronie', and 'BlueGem', known for deep green color and disease resistance
About This Grass
Forms a dense, fine-to-medium textured turf with an attractive rich green to dark green color. Height ranges from 1.5 to 2.5 inches when maintained, and up to 18-24 inches if left unmowed. Produces open, pyramidal panicle seed heads at maturity.
Blade Characteristics
Medium-fine blades (2-4mm width) with distinct boat-shaped tips, folded vernation in the bud, and parallel sides. Color ranges from medium to dark blue-green. Ligule is short and membranous, auricles are absent, and the collar is broad and continuous.
Root System
Moderately deep fibrous root system complemented by aggressive rhizomes. Moderate establishment speed from seed, creates a tight thatch layer over time, and forms a dense, tough sod with high wear recovery via rhizomes.
Growing Information
Origin Region
Europe and northern Asia; widely naturalized and cultivated across North America and temperate regions worldwide
Growth Habit
Rhizomatous, spreading extensively via underground stems to form a dense, uniform sod
Sunlight & Water Needs
Requires full sun (minimum 6-8 hours of direct sunlight) for optimal performance; moderate to high water needs. Has fair to good drought tolerance by entering summer dormancy, and prefers well-drained, fertile soils with a pH of 6.0 to 7.0.
Mowing & Maintenance
Mow at 2.0 to 3.0 inches height. High maintenance requirement with regular fertilization (3-4 lbs N per 1000 sq ft annually), frequent watering, and periodic dethatching and core aeration.
Special Characteristics
Excellent traffic and wear tolerance due to self-repairing rhizomes. Good cold tolerance, moderate drought resistance through dormancy, poor deep-shade tolerance, and moderate susceptibility to diseases like summer patch and dollar spot.
Ecological Information
Introduced species in North America. Provides good soil stabilization and erosion control due to dense root and rhizome matrix. Frequently blended with perennial ryegrass and fine fescues for improved disease resistance and wear characteristics.