• 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


Dahlia 'Ruby Murray'


Plants are at the heart of the RHS. We are the International Cultivar Registration Authority for nine plant groups, including dahlias.

Epimedium 'Amber Queen'

Plant collections

Come and see our 12 National Plant Collections, which are part of a scheme to preserve cultivated garden plants.

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RHS Plant Trials

We run plant trials every year to evaluate plants, giving the best ones the RHS Award of Garden Merit.

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Plant committees

Our specialist plant committees are sources of expertise, for instance in the judging process at RHS Shows and in the rolling review of RHS Award of Garden Merit (AGM) plants.

Horticultural database

Search for plants, suppliers and a wealth of other helpful & informative data.

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Anemone nemorosa