• 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


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

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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.