Kentucky Bluegrass
Poa pratensis · Cool-season, Perennial, C3 grass
Grass Family
Poaceae, subfamily Pooideae, tribe Poeae
Grass Category
Lawn/Turf Grass, Sports Turf, Golf Course Grass
Variety / Cultivar
Common blend or standard turf-type cultivars like 'Midnight' or 'Compact', known for dark green color and dense sod formation
Hardiness Zones
Thrives in USDA Hardiness Zones 3 through 7; excellent cold tolerance, surviving harsh northern winters, but struggles in extreme heat and humidity characteristic of the deep southern U.S.
About This Grass
Forms a dense, fine-to-medium-textured turf with rich dark green to blue-green coloration; typical maintained height is 2 to 2.5 inches, while unmowed growth can reach 18 to 24 inches with open, pyramidal panicle seed heads
Blade Characteristics
Blades are medium in width (2-4mm), feature flat to folded shapes with distinct boat-shaped tips, smooth texture, prominent parallel veins, and a folded vernation in the bud with a short membranous ligule and absent auricles
Root System
Moderately deep fibrous root system complemented by extensive underground rhizomes; moderate establishment speed from seed, forms a tough and dense sod that provides good wear recovery and moderate drought tolerance via summer dormancy
Growing Information
Origin Region
Native to Europe, northern Asia, and parts of the mountains of North America; widely cultivated throughout temperate regions worldwide, performing best in northern climates
Growth Habit
Rhizomatous, spreading underground via aggressive creeping rootstocks to form a dense, uniform turf mat
Sunlight & Water Needs
Requires full sun (at least 6-8 hours daily) for optimal growth, though some cultivars offer moderate shade tolerance; needs consistent moisture (approx. 1 inch of water per week) and exhibits moderate drought tolerance by going dormant during extended dry periods
Mowing & Maintenance
Ideal mowing height ranges from 2.0 to 3.0 inches; requires regular mowing during peak spring and fall growth; high fertilizer requirements (3-4 lbs N per 1000 sq ft annually); moderate to high maintenance level requiring occasional dethatching and aeration
Special Characteristics
Excellent traffic and wear tolerance due to its spreading rhizomes; good self-repairing capabilities; susceptible to certain diseases like dollar spot and leaf spot under high stress; excellent winter color retention compared to warm-season grasses
Ecological Information
Widely naturalized across North America; provides soil stabilization, erosion control, and high-quality turf for residential and recreational use; frequently blended with perennial ryegrass and fine fescues for balanced lawns