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Rhododendron occidentale (Torr. & A. Gray) A. Gray
USDA Symbol: RHOC
USDA Native Status: L48 (N)
A fragrant, loosely branched, spreading shrub that can reach 15 ft. in height but is usually 3-9 ft. tall. The bark is shredding. The leaves are thin, light green and oval. White, tubular flowers may be tinged pink and have a yellow-blotched upper lobe. Flowers occur in tightly compact clusters. A shrub with large, white to deep pink, very fragrant flowers in large clusters at stem ends.
Flower variations include mixtures of pale pink, deep pink, and yellow-orange. An evergreen, pink-flowered relative, California Rosebay (R. macrophyllum), grows from British Columbia to California and makes a choice ornamental; it is the state flower of Washington, where it is known as Red Rhododendron.
Plant CharacteristicsDuration: Perennial Habit: Shrub Leaf:
Fruit: Size Class:
Bloom InformationBloom Color: White
Bloom Time: Apr , May , Jun , Jul , Aug
, OR Native Distribution: CA
mts. from Kern & Santa Cruz Cos., n. to s.w. OR Native Habitat:
Stream banks and other moist places below 7500 ft.
Growing ConditionsWater Use: High
Light Requirement: Part Shade
Soil Moisture: Moist
Soil pH: Acidic (pH<6.8)
CaCO3 Tolerance: None
Soil Description: Moist, well-drained soil.
Conditions Comments: A parent of many hybrid azaleas.
BenefitWarning: Rhododendrons contain poisonous substances and should not be ingested by humans or animals. Honey made from flowers also may be toxic. POISONOUS PARTS: All parts. Highly Toxic, May be Fatal if eaten. Symptoms include salivation, watering of eyes and nose, abdominal pain, loss of energy, depression, nausea and vomiting, diarrhea, weakness, difficult breathing, progressive paralysis of arms and legs, coma. Toxic Principle: Andromedotoxin. (Poisonous Plants of N.C.)
Conspicuous Flowers: yes
Combine seeds loosely with sphagnum moss and sprinkle lightly over a 2:1 perlite/peat mixture. Optimum temperatures for germination are 45-50 degrees. Transplant seedlings to acid soil with a high content of organic matter. Cultivated evergreen
azaleas Seed Treatment:
No pretreatment is necessary. Commercially Avail:
Butterflies and Moths of North America (BAMONA)
is a larval host and/or nectar source for:
National Wetland Indicator Status
|Status:|| FAC || FAC |
This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1
(Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here
for map of regions.
From the National Suppliers Directory
According to the inventory provided by Associate Suppliers, this plant is available at the following locations:
Oregon Native Plant Nursery
- Woodburn, OR
From the National Organizations Directory
According to the species list provided by Affiliate Organizations, this plant is either on display or available from the following:
Santa Barbara Botanic Garden
- Santa Barbara, CA
Record Last Modified: 2010-11-23
Research By: TWC Staff