Prostrate Knotweed
Polygonum aviculare · Summer Annual, C3 Broadleaf (Broadleaf weed performing as turf-mimic)
Grass Family
Polygonaceae (Buckwheat Family); note: not a true grass (Poaceae)
Grass Category
Invasive/Weed Grass mimic, often found in compacted lawns and sports turf
Variety / Cultivar
Not applicable as it is a wild species/weed
Hardiness Zones
USDA Zones 3-10; tolerant of extreme heat and foot traffic; dies back after first hard frost
About This Grass
Dense, low-growing mat of wiry stems that creates a flat green carpet; often mistaken for grass from a distance but consists of many small, oval leaves; brownish insignificant flowers in leaf axils
Blade Characteristics
Leaves are alternate, simple, small (1/2 to 1 inch long), elliptical or oblong, blue-green in color, with pointed or rounded tips; features a papery sheath (ocrea) at the base of each leaf joint
Root System
Deep, central taproot that penetrates compacted soil; lacks rhizomes or stolons but stems can sprawl extensively; very fast establishment in disturbed soil
Growing Information
Origin Region
Native to Europe and parts of Asia; widely naturalized across North America
Growth Habit
Prostrate, mat-forming; stems radiate from a central taproot to form dense groundcover
Sunlight & Water Needs
Full sun to partial shade; highly drought-tolerant; thrives in dry, compacted soils where traditional turf fails
Mowing & Maintenance
Extremely low mowing tolerance (can survive at 0.5 inches); usually managed through aeration and herbicides rather than mowing height; Low maintenance for 'growth' but High effort for 'removal'
Special Characteristics
Incredible traffic tolerance; salt tolerant; thrives in high-compaction areas like paths and goal mouths; indicator of poor soil aeration
Ecological Information
Introduced/Invasive status in turf; provides seeds for small birds (sparrows, finches); colonizes bare/disturbed sites; often outcompetes weakened Kentucky Bluegrass