Rhododendron
Rhododendron johnstoneanum
Ericaceae · broadleaf deciduous shrub · introduced
Last updated
A broadleaf shrub in the Ericaceae, R. johnstoneanum is a species from northeastern India and adjacent Myanmar. Blooms on previous season's growth. The species is known for fragrant, white to pale yellow, funnel-shaped flowers sometimes flushed pink or spotted red.
Requires acidic, well-drained soil in sheltered conditions. Best suited to mild climates where winter temperatures do not drop severely. Twenty-one diseases and 15 pests documented at the genus level. All parts are toxic if ingested.
Root Colonization (Spring–Fall)
Infection at Bud Break
Apothecia Formation & Spore Release
Aecial Stage (Alternate Host)
+ 13 more — see full disease and pest lists below