Diascia (annual and perennial) trial 2024

Objectives and purpose of the trial

The focus of this trial is to assess and compare annual and perennial selections of Diascia (twinspur) cultivars currently available to grow. This is the first Diascia trial to take place at RHS Wisley, Surrey since 1995. For this trial, annual cultivars are being assessed over one summer, and perennial cultivars are being grown for two summers, to see how they perform. Those that perform best will be awarded the RHS Award of Garden Merit (AGM).
Stunning Diascia plants in the trial beds during the summer
Colourful perennial Diascia plants flourishing in pots

Judges and criteria

Judging criteria

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

  • Habit
  • Flower power

  • Vigour
  • Pest and disease resistance

Suppliers to the trial

List of plants in the trial

View all the Diascia on trial at RHS Wisley

Annuals

  • Diascia [Breezee Plus White] (Breezee Series)
  • Diascia [Juliet White] (‘Baljalite’)
  • Diascia ‘Diamond White Blush’
  • Diascia [Piccadilly White] (‘Kledb24020’) (Piccadilly Series)
  • Diascia [Flying Colours White] (Flying Colours Series)
  • Diascia [Divara White] (Divara Series)
  • Diascia [Elfjes Daantje] (Elfjes Series)
  • Diascia [Breezee Plus Apple Blossom] (Breezee Series)
  • Diascia ‘Diamond Light Pink’
  • Diascia [Flying Colours Appleblossom] (‘Diastara’) (Flying Colours Series)
  • Diascia [Flying Colours Light Pink] (Flying Colours Series)
  • Diascia [Piccadilly Appleblossom] (‘Kledi04015’) (Piccadilly Series)
  • Diascia ‘Aurora Cherry Blossom’ (Towers of Flowers Series)
  • Diascia [Divara Blush] (Divara Series)
  • Diascia [Genta Pink] (Genta Series)
  • Diascia [Breezee Plus Pink] (Breezee Series)
  • Diascia barberae [Juliet Pink With Eye] (‘Baljulpiney’)
  • Diascia ‘Diamond Pink’
  • Diascia [Little Dancer] (‘Pendan’)
  • Diascia [Little Dreamer] (‘Pender’)
  • Diascia [Flying Colours Antique Rose] (‘Diastu’) (Flying Colours Series)
  • Diascia [Flying Colours Rose] (Flying Colours Series)
  • Diascia [Piccadilly Hot Pink] (‘Kledb10714’) (Piccadilly Series)
  • Diascia [Divara Pink] (Divara Series)
  • Diascia [Elfjes Doortje] (‘Sumdia 01’) (Elfjes Series)
  • Diascia [Elfjes Rose xxl] (Elfjes Series)
  • Diascia ‘Diamond Fuchsia’
  • Diascia ‘Aurora Dark Pink’ (Towers of Flowers Series)
  • Diascia [Little Drifter] (‘Pendrif’)
  • Diascia [Breezee Plus Apricot] (Breezee Series)
  • Diascia [Flying Colours Deep Salmon Improved] (‘Dala Depsam’) (Flying Colours Series)
  • Diascia [Piccadilly Dark Salmon] (‘Kledb18008’) (Piccadilly Series)
  • Diascia ‘Aurora Apricot’ (Towers of Flowers Series)
  • Diascia ‘Divara Giga Salmon’ (Divara Series)
  • Diascia ‘Divara Salmon’ (Divara Series)
  • Diascia [Elfjes Salmon xxl] (Elfjes Series)
  • Diascia [Breezee Plus Orange] (Breezee Series)
  • Diascia barberae [Juliet Orange] (‘Balajulor’)
  • Diascia ‘Diamond Dark Orange’
  • Diascia [Divara Orange] (Divara Series)
  • Diascia ‘Divara Giga Orange’ (Divara Series)
  • Diascia [Elfjes Jasper] (‘Sumdia 08’) (Elfjes Series)
  • Diascia [Piccadilly Orange] (Piccadilly Series)
  • Diascia [Breezee Plus Red] (Breezee Series)
  • Diascia barberae [Juliet Red] (‘Baljuled’)
  • Diascia [Flying Colours Red] (‘Diastonia’) (Flying Colours Series)
  • Diascia [Piccadilly Dark Red] (‘Kledb11787’) (Piccadilly Series)
  • Diascia [Divara Deep Red] (Divara Series)
  • Diascia ‘Divara Deep Red’ (Divara Series)
  • Diascia ‘Divara Giga Rose’ (Divara Series)
  • Diascia [Elfjes Jochie] (‘Sumdia 03’) (Elfjes Series)
  • Diascia ‘Rose Queen’

Perennials

  • Diascia barberae ‘Ruby Field’
  • Diascia [Blue Bonnet] (‘Hecbon’)
  • Diascia ‘Coldham’
  • Diascia ‘Emma’
  • Diascia fetcaniensis
  • Diascia fetcaniensis ‘Daydream’
  • Diascia ‘Hopleys’
  • Diascia integerrima
  • Diascia integerrima ‘Blush’
  • Diascia ‘Lilac Belle’
  • Diascia personata
  • Diascia personata ‘Coral Spires’
  • Diascia personata shorter form
  • Diascia [Piccadilly Denim Blue] (‘Kledb06039’)
  • Diascia ‘Monhop Apricot’
  • Diascia ‘Monhop Pink’
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.