• AGM plants

    AGM plants have been through a rigorous trial and assessment programme. They are:

    • Excellent for ordinary use in appropriate conditions
    • Available to buy
    • Of good constitution
    • Essentially stable in form & colour
    • Reasonably resistant to pests & diseases

Rhododendron cultivar registration

The RHS is the International Cultivar Registration Authority for the genus Rhododendron.

Registration

Download registration forms here:

Application form to register a Rhododendron cultivar name

Publications

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 

Gardening with the RHS

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Get involved

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.