Smartweed (Often mistaken for a grass weed in turf)
Polygonum pensylvanicum · Warm-season broadleaf annual
Grass Family
Polygonaceae (Not a true grass, but broadleaf weed often found in turf)
Grass Category
Invasive/Weed Grass alternative
Variety / Cultivar
Wild type
Hardiness Zones
USDA Hardiness Zones 3-9
About This Grass
Spreading broadleaf plant featuring reddish stems, swollen nodes, and lance-shaped leaves, commonly found invading damp lawns and turf areas.
Blade Characteristics
Not applicable as this is a broadleaf weed, featuring alternate simple leaves with ocreae (sheathing stipules) at the nodes.
Root System
Fibrous root system with shallow taproot, thrives in wet compacted soils.
Growing Information
Origin Region
North America
Growth Habit
Stoloniferous and erect branching stems
Sunlight & Water Needs
Full sun to partial shade, high moisture requirements, very common in poorly drained, over-watered soils.
Mowing & Maintenance
Resists low mowing by spreading horizontally; controlled primarily through broadleaf herbicides and improving soil drainage.
Special Characteristics
Low wear tolerance, highly adaptable to wet soils, acts as an indicator weed for poor drainage and soil compaction.
Ecological Information
Native weed providing minor food sources for waterfowl and wetland wildlife, but generally considered a nuisance in managed turfgrass.