Helianthemum trial 2024–2026

Objectives and purpose of the trial

The focus of this trial is on Helianthemum (rock roses), which haven’t been trialled by the RHS since 1970. Since then, a number of new varieties have become available, and now is the chance to demonstrate the diversity of rock roses available to gardeners. The RHS Trials team aim to compare new and established cultivars at RHS Wisley, Surrey, and those that perform best will be awarded the RHS Award of Garden Merit (AGM).
Young Helianthemum planted in the Trial Garden at RHS Wisley
Close up plant portrait of lucious pink Helianthemum ‘Diana’

Judges and criteria

Judging criteria

The following factors are all taken into consideration as part of the judging of the trial:

  • Floriferousness and length of flowering season
  • Flower to foliage balance

  • Attractiveness of foliage
  • Health and vigour

Suppliers to the trial

List of plants in the trial

View all the helianthemums on trial at RHS Wisley
  • Helianthemum ‘Amabile Plenum’
  • Helianthemum ‘Amy Baring’
  • Helianthemum apenninum
  • Helianthemum ‘Beech Park Red’
  • Helianthemum ‘Beech Park Scarlet’
  • Helianthemum ‘Ben Fhada’
  • Helianthemum ‘Ben Heckla’
  • Helianthemum ‘Ben Hope’
  • Helianthemum ‘Ben Ledi’
  • Helianthemum ‘Ben More’
  • Helianthemum ‘Ben Vane’
  • Helianthemum ‘Boughton Double Primrose’
  • Helianthemum ‘Bunbury’
  • Helianthemum ‘Cerise Queen’
  • Helianthemum ‘Cheviot’
  • Helianthemum ‘Chocolate Blotch’
  • Helianthemum ‘Coachman's Salmon Coral’
  • Helianthemum ‘David Ritchie’
  • Helianthemum ‘Diana’
  • Helianthemum ‘Elfenbeinglanz’
  • Helianthemum ‘Fairy’
  • Helianthemum ‘Fire Dragon’
  • Helianthemum ‘Fireball’ (syn. of ‘Mrs C.W. Earle’)
  • Helianthemum ‘Georgeham’
  • Helianthemum ‘Golden Queen’
  • Helianthemum ‘Hartswood Ruby’
  • Helianthemum ‘Henfield Brilliant’
  • Helianthemum ‘Highdown Apricot’
  • Helianthemum ‘Honeymoon’
  • Helianthemum ‘Jubilee’
  • Helianthemum ‘Kathleen Mary’
  • Helianthemum ‘Lawrenson’s Pink’
  • Helianthemum ‘Marianne’
  • Helianthemum ‘Mrs C.W. Earle’
  • Helianthemum ‘Mrs Hays’
  • Helianthemum ‘Mrs Mould’
  • Helianthemum ‘New Moon’
  • Helianthemum nummularium
  • Helianthemum nummularium subsp. glabrum
  • Helianthemum oelandicum subsp. italicum
  • Helianthemum oelandicum subsp. piloselloides
  • Helianthemum orange/apricot-flowered
  • Helianthemum ‘Orchard’s Nevis’
  • Helianthemum ‘Peach Melba’
  • Helianthemum ‘Pink Angel’
  • Helianthemum ‘Raspberry Ripple’
  • Helianthemum ‘Red Dragon’
  • Helianthemum ‘Rhodanthe Carneum’ (syn. ‘Wisley Pink’)
  • Helianthemum ‘Rosakönigin’ (syn. ‘Rose Queen’)
  • Helianthemum ‘Shot Silk’
  • Helianthemum ‘Sterntaler’
  • Helianthemum ‘Strawberry Fields’
  • Helianthemum ‘Sudbury Gem’
  • Helianthemum ‘Sulphureum Plenum’
  • Helianthemum ‘Supreme’
  • Helianthemum ‘The Bride’
  • Helianthemum ‘Wisley Primrose’
  • Helianthemum ‘Wisley White’
RHS Award of Garden Merit logo
Buy AGM plants at RHSplants.co.uk

Choose from hundreds of specially-selected plants, bulbs, seeds and gardening products in our online shop.

Shop now

Handy tools and information

Get in touch

For more information on our RHS Plant Trials or to access older trial reports, please get in touch with our team via email at [email protected].

Get involved

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.