• 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

Horticultural shows

Competitions within RHS Horticultural shows are open to all - check our list of 2015 shows, from ornamental plants to fruit and veg (20kB pdf)

For specialist show schedules and forms, please email the Horticultural Competitions Manager Georgina Barter, tel: 020 7821 3142.

2015 Plant Society events at RHS Garden Wisley


Dahlia FascinationThe National Dahlia Society
8–13 September

Featuring the NDS Annual Show (8 - 11 Sept), dahlia displays (12 - 13 Sept) and People's Dahlia Competition, as part of The Wisley Flower Show.
More about the National Dahlia Society


Dahlia Northwest CosmosDahlia Study Day
23 September  

Talks, demonstrations and displays linked to the Dahlia Trial. Featuring flower and photo displays, plant sales, educational displays and the chance to ask the experts your questions. More about the National Dahlia Society. See a draft programme for the day. 10am - 4pm Hillside Event Centre


Primula CherryAlpine Open Day  – 1 October

Join experts and enthusiasts from the world of alpine and rock garden plants at this joint RHS, Alpine Garden Society (AGS) and Scottish Rock Garden Club (SRGC) open day.

Talks, practical demonstrations, a photographic exhibition, and other activities will be held at the Hillside Events Centre. There will also be plant sales at the Wisley Plant Centre and by other specialist alpine nurseries, an open session of the Joint Rock Garden Plant Committee, and guided tours of the Wisley Rock Garden and Alpine Department.

Free with normal garden admission


Cyclamen hederifolium

Cyclamen Autumn Show
11 October

The Cyclamen Society Autumn Show, offering exhibits of autumn-flowering Cyclamen and companion bulbous plants. Meet the cyclamen experts, too. More about the Cyclamen Society
10am - 4pm Hillside  Event Centre

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