Diascia (twinspur), perennial trial 2024–2025

Objectives and purpose of the trial

The focus of this trial is to assess and compare perennial selections of Diascia (twinspur) cultivars currently available to grow. This is an extention of the 2024 trial that included annual bedding Diascia. The RHS Trials team at RHS Wisley, Surrey, will grow and display these cultivars over 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 2024

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

• Kernock Park Plants
• Ball Colegrave
• Pentland Plants
• Syngenta
• Volmary
• RG Plants
• Thompson & Morgan
• Beth Chatto’s Plants and Gardens

• Special Plants Nursery
• Wildegoose Nursery
• Binny Plants
• Shire Plants
• Farmyard Nurseries
• D’Arcy & Everest
• Rijnbeek

List of plants in the trial

View all the Diascia perennials on trial at RHS Wisley

• 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’

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 trials@rhs.org.uk.