Douglas's Knotweed
Polygonum douglasii
Last reviewed: June 2026
Light
full sun
Water
low
Size
4"–16" H × 2"–8" W
Bloom
Jun, Jul, Aug
Native to
AZ, CA, CO, IA and 16 more states
Pollinators
bees, beetles
Browse plants for this ecoregion
Douglas's knotweed is a low-growing annual wildflower that forms small mats close to the ground. It produces tiny white or pink flowers during summer months and thrives in sunny, dry conditions with minimal water requirements.
In an HOA neighborhood
Douglas's 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.
- Very small stature may appear weedy
- Annual lifecycle creates gaps when plant dies
- Common name includes 'weed' which raises HOA concerns
Wildlife value
This plant provides nectar for native bees and serves as a food source for beetles during its summer blooming period.
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 Douglas's Knotweed fit your yard? Open it in Pollinator Patch to check it against your sun, soil, and HOA-conscious filters.