Racemosum Rhododendron

Rhododendron racemosum

Ericaceae · broadleaf evergreen shrub · introduced

Last updated

An evergreen shrub native to Yunnan and Sichuan, China, ranging from 2 to 5 feet. Small funnel-shaped flowers, under 1 inch across, in shades of pink to white, produced along the stems (in the leaf axils) as well as at the branch tips.

The axillary flowering habit, with blooms produced along the stems rather than just at the tips, gives this species a different visual effect from most rhododendrons. 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
2–5 ft
Origin
China (Yunnan, Szechwan)
Watch for this season

Root Colonization (Spring–Fall)

Gall Development & Sporulation

Flower Infection & Sporulation

RustHigh

Aecial Stage (Alternate Host)

+ 13 more — see full disease and pest lists below

Field Observations

Rhododendron racemosum - full bloom
Field Observation
Rhododendron racemosum · Racemose Rhododendron
full bloom
April 20, 2026 · Lake Wilderness Arboretum · 1,509 GDD₃₂ · BBCH 65

Phenological Calendar

Stage Typical Window
Full bloom BBCH 65

Diseases: Regionally Documented (21)

Pests: Regionally Documented (15)

Data Maturity
Structured Multiple sources. Expert review underway.