Great Rhododendron
Rhododendron maximum
Last reviewed: June 2026
Great Rhododendron 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
part shade
Water
high
Size
60"–180" H × 60"–180" W
Bloom
Jun, Jul, Aug
Native to
AL, CT, DE, GA and 16 more states
Pollinators
bees, butterflies, hummingbirds
Great rhododendron is a large native evergreen shrub that produces clusters of white to pale pink flowers in summer. This substantial plant maintains year-round structure and can serve as an excellent foundation or screening plant in partially shaded areas.
In an HOA neighborhood
Great Rhododendron is an HOA-friendly choice. Maintenance level: moderate. Tidiness: 4 out of 5.
Works well in: front yard, foundation, mid zone.
- Very large mature size may overwhelm smaller properties
- Requires consistent moisture which may increase maintenance needs
Wildlife value
Host plant for Azalea sphinx moth.
The abundant summer blooms attract bees, butterflies, and hummingbirds. The dense evergreen foliage provides year-round shelter for birds and small wildlife.
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 Great Rhododendron and shows pet-safe natives for your ecoregion instead.