• 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

Plants

Cynoglossum amabile - a short-lived perennial best grown as a biennial

10 of the best... biennials

Biennials are some of our most valuable spring and summer flowers. Here's a selection of plantsman Graham Rice's favourites, all winners of the RHS Award of Garden Merit

Annuals

Perennials

Trees

Shrubs

Bulbs

Herbs

Fruit

Vegetables

Greenhouse

Climbers

Plants for pollinators

Plant awards

Ian Tocher (RHS Staff) avatar

Flowering currants and fossil trees

by Ian Tocher

The flowering currant trial at RHS Garden Wisley is looking wonderful ...

Read more about Flowering currants and fossil trees

RHS Plant Trials and awards

Every year we trial dozens of plants to find out how they will perform in your garden. The very best are awarded the RHS Award of Garden Merit (AGM).

Read more

Trialling plants at Wisley