• 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

Helleborus [HGC Cinnamon Snow] = 'Coseh 700'

Discover new trends in hellebores

There's a lot happening in the world of hellebores at the moment; from new colour breaks to extended flowering seasons and novel forms to delight gardeners

Annuals

Perennials

Trees

Shrubs

Bulbs

Herbs

Fruit

Vegetables

Greenhouse

Climbers

Plants for pollinators

Plant awards

Sue Drew (RHS Staff) avatar

Stunning sarracenias for a sunny windowsill

by Suzanne Drew

An offsite trial of these colourful carnivores aims to find easy, reliable ...

Read more about Stunning sarracenias for a sunny windowsill

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).

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Trialling plants at Wisley