Bitter Dock
Rumex obtusifolius
Last reviewed: August 2026
Bitter Dock is toxic to dogs and cats.
Listed as toxic by the ASPCA Animal Poison Control Center (opens in new tab) (last reviewed 2026-08-15). 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"–48" H × 12"–24" W
Bloom
Jun, Jul, Aug
Pollinators
bees, beetles
Native alternatives to Bitter Dock
Bitter Dock is not native to the United States. These natives fill a similar role in a planting, matched on bloom season, bloom color and mature size.
Before you buy
Your city may pay you to plant this
Cities and water utilities offer rebates for replacing lawn with native and water-wise plants. We track 452 programs across 44 states, each with a link to the provider and the date we last checked it.
Find rebates in your areaBitter dock is a tall perennial herb with large, broad leaves and distinctive reddish-brown seed spikes that develop in summer. This robust plant forms clumps and can spread aggressively if not managed, often appearing in disturbed soils and meadows.
In an HOA neighborhood
Bitter 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.
- Often considered a weed due to aggressive spreading
- Can look untidy with large basal leaves
- May self-seed prolifically in unwanted areas
Wildlife value
The flowers attract bees and beetles during summer blooming. Seeds provide food for birds and small mammals in fall.
Common questions
- How much sun does Bitter Dock need?
- Bitter Dock grows best in full sun conditions.
- When does Bitter Dock bloom?
- Bitter Dock blooms in June, July, and August.
- Is Bitter Dock toxic to dogs?
- Yes. Bitter 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 Bitter Dock toxic to cats?
- Yes. Bitter 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.
- What pollinators does Bitter Dock attract?
- Bitter Dock draws bees and beetles.
- Is Bitter Dock HOA-friendly?
- Bitter Dock takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.
Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.
If something looks wrong
Common plant problems, and what to check first
These come up on almost any plant. Each guide lists the likely causes in the order they are worth ruling out, with one thing to check before you act on any of them, and links to the source it came from.
- It is dying right after planting
- Leaves turning yellow
- Wilting even though I watered it
- Brown crispy leaf tips
- Bugs on the plant
Pollinator Patch flags toxic plants like Bitter Dock and shows pet-safe natives for your ecoregion instead.
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