Join the RHS today and support our charitable work
The new app packed with trusted gardening know-how
RHS members get reduced ticket prices
RHS members get free access to RHS Gardens
Free entry to RHS members at selected times »
Reduced prices on RHS Garden courses and workshops
The RHS is the International Cultivar Registration Authority for the genus Rhododendron.
Download registration forms here:
Application form to register a Rhododendron cultivar name
The RHS publishes The Rhododendron Register and Checklist 2004 and subsequent supplements, some of which are available from the link below.
Rhododendron registers and supplements
Join the RHS today and save 25%
Listen to our award-winning gardening podcasts
The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.