Clammy Locust
Robinia viscosa
Last reviewed: June 2026
Clammy Locust is toxic to dogs and cats.
Listed as toxic by the ASPCA Animal Poison Control Center (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
low
Size
240"–360" H × 120"–240" W
Bloom
May, Jun, Jul
Native to
AL, CT, GA, IL and 20 more states
Pollinators
bees, butterflies
Clammy locust is a medium-sized native tree that produces fragrant pink flower clusters in late spring through summer. This drought-tolerant tree grows 20-30 feet tall with an open, irregular canopy and compound leaves that provide filtered shade.
In an HOA neighborhood
Clammy Locust takes more care to keep looking intentional in a front yard. Maintenance level: moderate. Consider it for backyard or mid-zone beds rather than the street edge.
Works well in: backyard only.
- Irregular growth habit looks unkempt
- Tends to sucker and spread aggressively
- Can appear weedy due to thorny branches
Wildlife value
Host plant for silver-spotted skipper, long-tailed skipper.
The showy pink flowers attract bees and butterflies during the extended bloom period from May through July. As a member of the legume family, it also fixes nitrogen in the soil.
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 Clammy Locust and shows pet-safe natives for your ecoregion instead.