Sawatch Knotweed
Polygonum sawatchense
Last reviewed: July 2026
Light
part sun
Water
medium
Size
6"–12" H × 6"–12" W
Bloom
Jul, Aug, Sep
Native to
AZ, CA, CO, ID and 10 more states
Pollinators
bees, beetles
Browse plants for this ecoregion
Sawatch knotweed is a compact native perennial that forms low mounds of small leaves with clusters of tiny white or pink flowers from summer into fall. This alpine species stays neat and tidy, making it suitable for rock gardens or as a groundcover in partially sunny areas.
In an HOA neighborhood
Sawatch Knotweed is an HOA-friendly choice. Maintenance level: low. Tidiness: 4 out of 5.
Works well in: front yard, foundation, street edge, mid zone.
Wildlife value
The small flowers attract bees and beetles during the late summer blooming period. As a native wildflower, it provides habitat value for local pollinators.
Common questions
- How much sun does Sawatch Knotweed need?
- Sawatch Knotweed grows best in part sun conditions.
- When does Sawatch Knotweed bloom?
- Sawatch Knotweed blooms in July, August, and September.
- Where is Sawatch Knotweed native?
- Sawatch Knotweed (Polygonum sawatchense) is native to AZ, CA, CO, ID and 10 more states, per the USDA PLANTS Database and regional native plant society lists.
- What pollinators does Sawatch Knotweed attract?
- Sawatch Knotweed draws bees and beetles.
- Is Sawatch Knotweed HOA-friendly?
- Sawatch Knotweed is generally an HOA-friendly choice in the right placement, with low maintenance.
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.
Ready to grow Sawatch Knotweed? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.
Not sure where to start? Take the 2-minute yard quiz