Kentucky Bluegrass
Poa pratensis · Cool-season, Perennial, C3 grass
AI-generated identification · may be incorrect
Grass Category
Lawn/Turf Grass
Hardiness Zones
Thrives in USDA Hardiness Zones 3-7, excellent cold tolerance, enters dormancy during severe summer heat or drought.
Grass Family
Poaceae, subfamily Pooideae
Variety / Cultivar
Midnight (known for dark green color and dense growth)
About This Grass
Forms a dense, high-quality turf with a medium-fine texture and deep green to blue-green color. Mown height is typically low, while unmowed height can reach 18-24 inches with open panicle seed heads.
Blade Characteristics
Blades are medium-fine width (2-4mm), folded in the bud (Vernation), with distinctive boat-shaped tips and parallel sides. Features prominent parallel veins and a membranous ligule.
Root System
Fibrous root system with aggressive underground rhizomes, moderate depth, medium-fast establishment from seed, and a high tendency to form thatch if over-fertilized.
Growing Information
Origin Region
Europe and Northern Asia; widely cultivated across North America and temperate regions worldwide
Growth Habit
Rhizomatous, spreading extensively via underground stems to form a dense, uniform turf
Sunlight & Water Needs
Requires full sun (minimum 6-8 hours daily), moderate to high water needs, fair to good drought tolerance through summer dormancy, prefers well-drained loamy soil with a pH of 6.0-7.0.
Mowing & Maintenance
Ideal mowing height is 2.0 to 3.5 inches, frequent mowing during peak growth, requires 2-4 lbs N per 1000 sq ft annually, moderate to high maintenance level with regular dethatching and aeration.
Special Characteristics
High wear tolerance and excellent self-repairing capability due to rhizomes; moderate shade tolerance; susceptible to certain diseases like dollar spot and leaf spot under stress.
Ecological Information
Introduced species in North America, provides basic turf ecosystem services, stabilizes soil effectively against erosion, commonly blended with perennial ryegrass and fine fescues.