Kentucky Bluegrass (with Yellow Nutsedge weed present)
Poa pratensis · Cool-season, Perennial, C3 grass
Grass Family
Poaceae, Subfamily Pooideae, Tribe Poeae
Grass Category
Lawn/Turf Grass
Variety / Cultivar
Commonly found in 'Midnight' or 'Baron' type blends; exact cultivar unknown
Hardiness Zones
USDA Zones 2-7; excellent cold tolerance, enters dormancy during extreme heat/drought and winter.
About This Grass
A medium-textured, cool-season turfgrass known for its dark green color and dense carpet-like growth. It produces panicle-type seed heads if left unmowed. The image shows a base of mowed bluegrass with taller, lighter green blades of Yellow Nutsedge emerging through the canopy.
Blade Characteristics
Blades are 2-4mm wide, V-shaped or flat, featuring a distinct boat-shaped (prow-like) tip. Color is dark green to blue-green. Vernation is folded in the bud; ligule is short and membranous; auricles are absent.
Root System
Moderate depth (6-12 inches) with an extensive system of underground rhizomes that facilitate sod formation, thatch development, and recovery from traffic or injury.
Growing Information
Origin Region
Native to Europe, Northern Asia, and parts of Africa; Widely cultivated across Northern US and Canada
Growth Habit
Rhizomatous (spreading underground), forming a dense, uniform sod with moderate rate of spread
Sunlight & Water Needs
Full Sun preferred (6+ hours), moderate shade tolerance. High water needs; requires deep, consistent watering during summer. Prefers well-drained fertile soil with pH 6.0-7.0.
Mowing & Maintenance
Ideal height 2.0-3.5 inches; high maintenance. Needs 2-4 lbs Nitrogen per 1000 sq ft per year. Frequent mowing and periodic aeration/dethatching required.
Special Characteristics
Excellent wear tolerance and recovery due to rhizomes; susceptible to leaf spot, melting out, and necrotic ring spot; high aesthetic value for home lawns and sports fields.
Ecological Information
Introduced status in North America; provides soil stabilization via dense sod; high water filtration value; often blended with Perennial Ryegrass or Fine Fescue for better resilience.