Purple Clematis
Clematis occidentalis
Last reviewed: July 2026
Clematis occidentalis is a native climbing vine producing purple flowers from May through July across northern and western US states. This deciduous clematis attracts bees and butterflies while tolerating various light and moisture conditions.
Purple Clematis 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 sun
Water
medium
Size
36"–120" H × 24"–72" W
Bloom
May, Jun, Jul
Native to
CO, CT, DE, IA and 23 more states
Pollinators
bees, butterflies
Purple clematis is a native climbing vine that produces attractive purple flowers from May through July. It grows 3-10 feet tall and requires some support structure like a trellis, fence, or arbor to climb effectively.
Growing Purple Clematis
Grow Purple Clematis in part sun and medium water. Mature plants reach 36 to 120 inches tall and spread 24 to 72 inches wide. Expect moderate maintenance to keep it looking intentional in a front yard.
In an HOA neighborhood
Purple Clematis is an HOA-friendly choice. Maintenance level: moderate. Tidiness: 3 out of 5.
Works well in: foundation, mid zone.
- Requires support structure like trellis or fence
- Can look bare in winter as deciduous vine
- May appear unruly without regular pruning
Wildlife value
The flowers attract bees and butterflies during the extended blooming period. This native clematis provides nectar for pollinators when many other spring flowers have finished.
Common questions
- When does Clematis occidentalis bloom?
- Purple Clematis blooms from May through July, producing distinctive purple flowers during late spring and early summer.
- Where is Clematis occidentalis native?
- This clematis is native across much of the northern and western United States, including states from Maine to Washington and south to New Mexico and North Carolina.
- What pollinators visit Purple Clematis?
- Bees and butterflies are the primary pollinators of Clematis occidentalis, visiting the purple flowers for nectar and pollen.
- What growing conditions does Clematis occidentalis prefer?
- Purple Clematis is adaptable to various light conditions from full sun to partial shade and tolerates a range of soil moisture levels from dry to moist.
- Is Purple Clematis toxic to dogs?
- Yes. Purple Clematis 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 Purple Clematis toxic to cats?
- Yes. Purple Clematis 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 Purple Clematis HOA-friendly?
- Purple Clematis is generally an HOA-friendly choice in the right placement, with moderate 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.
Pollinator Patch flags toxic plants like Purple Clematis and shows pet-safe natives for your ecoregion instead.
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