ARS California Chapter
Provides newsletter, event calendar and directory of officers.

Société Bretonne du Rhododendron
Bilingual in French and English, Marc Colombel's website for hybrid images. Rhododendron propagation by seed, cuttings and grafting with images, directions, and FAQs.

Seattle Rhododendron Society
Presents program information, newsletter and events.

The De Anza Chapter of the ARS
California group features schedule of events, newsletter archive and membership information.