• 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

heatherPlant Heritage, formerly the National Council for the Conservation of Plants and Gardens (NCCPG), was established in 1978 with the aim of encouraging and overseeing the establishment of well-documented and researched collections of garden plants.

In the main, each collection is devoted to a single genus, but a few have a broader remit. Taxonomic research is encouraged, as is the placing of voucher specimens in the RHS Herbarium at Wisley. Documentation kept for the National Plant Collections includes descriptions, photographs, cultivation information and details of the origin and history of each plant. Duplicate collections help ensure the security of the Collections.

Currently, there are more than 650 registered National Plant Collections. Further information about Plant Heritage and its National Plant Collections scheme can be found on the NCCPG website.

National Plant Collections in RHS Gardens

Between them, RHS Gardens Wisley, Rosemoor, Hyde Hall and Harlow Carr hold 12 National Plant Collections*, under the auspices of Plant Heritage.

Wisley currently maintains collections of Crocus, Epimedium, heathers, rhubarb, gooseberries and redcurrants. The heather collection comprises plants from the genera Erica, Calluna and Daboecia.

At Rosemoor are collections of Cornus and Ilex, while Hyde Hall holds the collection of Viburnum with the RHS Award of Garden Merit.

Harlow Carr maintains a collection of Dryopteris, which has a provisional status.

Each National Plant Collection held by the RHS has an appointed custodian.


Useful links

Visit the Plant Heritage website

Search the National Plant Collections database

*The heather collection comprises plants from the genera Erica, Calluna and Daboecia; this, along with the provisional status of the Dryopteris collection at Harlow Carr explains the reason why sometimes the RHS is said to hold nine National Plant Collections while other sources list twelve.

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