• 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

Viburnum plicatum f tomentosumThe National Plant Collection of Viburnum is held in RHS Garden Hyde Hall, Essex. It now totals about 250 accessions, representing nearly 70 species and infraspecific taxa, and more than 60 cultivars.

Plants from the collection are displayed throughout the garden, these varied shrubs providing interest for visitors the whole year round.

The collection is being catalogued in the RHS Horticultural Database, and a start has been made in creating herbarium and photographic records of the collection.


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The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.