Western Azalea

Rhododendron occidentale

Ericaceae · broadleaf deciduous shrub · native

Last updated

A deciduous azalea native west of the Rocky Mountains, reaching 10 feet. Flowers are white, orange-pink, or red in bud, opening to white or salmon pink, usually with stripes and a faint yellow blotch, fragrant. The only azalea species native to the western United States.

Fragrant flowers and native status make this an ecologically significant species for Pacific Coast gardens and restoration plantings. An important parent in western deciduous azalea breeding. Acidic, well-drained soil. Twenty-one diseases and 15 pests documented at the genus level. All parts contain grayanotoxins and are toxic if ingested.

Quick Facts

Height
10 ft
Fall Color
Crimson, scarlet, yellow
Origin
Pacific Northwest native
Watch for this season

Root Colonization (Spring–Fall)

Infection at Bud Break

Apothecia Formation & Spore Release

RustHigh

Aecial Stage (Alternate Host)

+ 13 more — see full disease and pest lists below

Diseases: Regionally Documented (21)

Pests: Regionally Documented (15)

Cultivars (1)

'Irene Koster'
Common name: Irene Koster (Western) Azalea; Mature height: 4–6 ft
Data Maturity
Structured Multiple sources. Expert review underway.