• 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

RHS Plant Trials & Awards

See how we run our extensive Plant Trials, and read all about the RHS Award of Garden Merit (AGM), which is only awarded to plants of proven garden-worthiness

Ryan Bodsworth (RHS Staff) avatar

Clematis reach new heights at Wisley

by Ryan Bodsworth

A trial of these popular garden climbers is given attractive new supports for ...

Read more about Clematis reach new heights at Wisley

RHS Plant Trials

Trial plants are submitted by nurseries, individuals and breeders.

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Plant awards

At the RHS, we assess garden plants based on their consistency, reliability and excellence for ordinary garden use. See which ornamentals, fruit and vegetables have received the RHS Award of Garden Merit.

New AGM lists

See the most recent AGM lists of plants.

AGM lists