Curled Dock
Rumex crispus
Last reviewed: September 2026
Curled 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
part shade
Water
medium
Size
24"–48" H × 12"–24" W
Bloom
May, Jun, Jul, Aug
Native alternatives to Curled Dock
Curled 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 areaCurled dock is a tall perennial herb with distinctive wavy-edged leaves and upright stems that produce clusters of small reddish-brown seeds. This hardy native plant grows 2-4 feet tall and tolerates various conditions, blooming from late spring through summer. The plant has a somewhat coarse, weedy appearance that makes it better suited for naturalized areas.
In an HOA neighborhood
Curled 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.
- Commonly considered a weed by many homeowners
- Tall growth habit can look unkempt
- Self-seeds readily and may spread
Wildlife value
The seeds provide food for birds and small mammals, while the foliage serves as host plant for some butterfly caterpillars. The long blooming period offers nectar for various small pollinators.
Common questions
- How much sun does Curled Dock need?
- Curled Dock grows best in part shade conditions.
- When does Curled Dock bloom?
- Curled Dock blooms in May, June, July, and August.
- Is Curled Dock toxic to dogs?
- Yes. Curled 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 Curled Dock toxic to cats?
- Yes. Curled 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 Curled Dock HOA-friendly?
- Curled 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 Curled Dock and shows pet-safe natives for your ecoregion instead.
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