Denseflower Knotweed
Persicaria glabra
Last reviewed: June 2026
Light
part sun
Water
medium
Size
12"–36" H × 6"–18" W
Bloom
Jul, Aug, Sep
Native to
AL, AR, DE, FL and 13 more states
Pollinators
bees, beetles
Browse plants for this ecoregion
Persicaria glabra is a native perennial that produces dense clusters of small white to pink flowers from summer through early fall. This compact plant forms neat clumps and thrives in partial sun with average moisture conditions.
In an HOA neighborhood
Denseflower Knotweed takes more care to keep looking intentional in a front yard. Maintenance level: low. Consider it for backyard or mid-zone beds rather than the street edge.
Works well in: backyard only.
- Name contains 'knotweed' which has negative associations
- May be confused with invasive knotweed species
- Relatively unknown plant may raise HOA concerns
Wildlife value
The dense flower clusters attract bees and beetles during the long blooming period from July through September.
Native range data from the USDA PLANTS Database and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.
Does Denseflower Knotweed fit your yard? Open it in Pollinator Patch to check it against your sun, soil, and HOA-conscious filters.