• 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

Plant trials & awards

A helping hand for gardeners

See how we run our plant trials and the RHS Award of Garden Merit (AGM)

Graham Rice

Multicoloured, yet black and white

by Graham Rice

Combining black and white in one plant is often a genetic impossibility –

Read more

RHS Plant Trials

Trial plants are submitted by nurseries, individuals and breeders.

Grower guides

Once an RHS Plant Trial has finished, we share the findings to help you choose the best plants for your garden.

New AGM lists

See the most recent AGM lists of plants.

AGM lists

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.