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
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The RHS is the UK’s gardening charity, helping people and plants to grow - nurturing a healthier, happier world, one person and one plant at a time.
