Western Dock
Rumex occidentalis
Last reviewed: June 2026
Rumex occidentalis (Western Dock) is a native forb found across western and northern US states that blooms from June through August. This medium-water plant thrives in full sun and attracts bees and beetles as pollinators.
Western Dock is toxic to dogs and cats.
Listed as toxic by the ASPCA Animal Poison Control Center (opens in new tab) (last reviewed 2026-05-21). If your pet has been exposed, call the ASPCA Animal Poison Control Center at (888) 426-4435and your veterinarian's emergency line.
Pollinator Patch flags toxic plants so you can choose a pet-safe native alternative for your yard.
Light
full sun
Water
medium
Size
24"–60" H × 12"–24" W
Bloom
Jun, Jul, Aug
Native to
AZ, CA, CO, IA and 14 more states
Pollinators
bees, beetles
Browse plants for this ecoregion
Western dock is a tall perennial herb with broad leaves and upright flower spikes that turn rusty red in summer. It grows vigorously in sunny locations with moderate moisture and can reach 5 feet tall. The plant produces clusters of small greenish flowers followed by distinctive reddish-brown seed heads.
Growing Western Dock
Grow Western Dock in full sun and medium water. Mature plants reach 24 to 60 inches tall and spread 12 to 24 inches wide. Expect low maintenance to keep it looking intentional in a front yard.
In an HOA neighborhood
Western Dock 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 tall and can appear weedy
- Aggressive self-seeder that spreads readily
- Dock species often considered agricultural weeds
Wildlife value
The flowers attract bees and beetles during the summer blooming period. Seeds provide food for birds and small mammals in fall and winter.
Common questions
- When does Western Dock bloom?
- Rumex occidentalis blooms from June through August, producing small greenish flowers in dense clusters.
- What pollinators visit Western Dock?
- Western Dock attracts bees and beetles, which visit the flowers for nectar and help with pollination.
- Where is Rumex occidentalis native?
- Western Dock is native to 18 states including most western states like California, Oregon, and Washington, plus several northern and mountain states from Montana to Vermont.
- What growing conditions does Western Dock prefer?
- This native forb grows best in full sun with medium to high water availability, making it suitable for moist meadows and streamside areas.
- Is Western Dock toxic to dogs?
- Yes. Western Dock is listed as toxic to dogs by the ASPCA Animal Poison Control Center (aspca.org). If your pet has been exposed, call the ASPCA Animal Poison Control Center at (888) 426-4435.
- Is Western Dock toxic to cats?
- Yes. Western Dock is listed as toxic to cats by the ASPCA Animal Poison Control Center (aspca.org). If your cat has been exposed, call the ASPCA Animal Poison Control Center at (888) 426-4435.
- Is Western Dock HOA-friendly?
- Western Dock takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.
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.
Pollinator Patch flags toxic plants like Western Dock and shows pet-safe natives for your ecoregion instead.
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