Potato, late maincrop trial 2024–2025

Objectives and purpose of the trial

The focus of this trial is to assess a range of late maincrop potato (Solanum tuberosum) cultivars, which are planted in mid-to-late April, for harvesting in late August to October. These plants will been grown to maturity and will produce larger harvests of bigger potatoes, which usually store well – this will be tested at the end of the trial. The RHS Trials team at RHS Wisley, Surrey, aims to compare, record and show the merits of new and established potato cultivars for garden use and cultivation. Those that perform best will be awarded the RHS Award of Garden Merit (AGM).

Freshly harvested potatoes, ready for the creating a delicious meal

Preserving the harvest – potatoes being stored for winter

Judges and criteria

Judging criteria

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

• Yield
• Colour
• Shape and uniformity

• Pest and disease resistance
• Storage (October to March)

Suppliers to the trial

• Agrico UK Ltd 
• Jamieson Brothers Ltd 
• ISJ Horticulture

• Skea Organic
• Cygent PB Ltd

List of plants in the trial

View all the potatoes on trial at RHS Wisley

• Solanum tuberosum ‘Alouette’
• Solanum tuberosum ‘Amour’
• Solanum tuberosum ‘Belle de Fontenay’
• Solanum tuberosum ‘Blue Anneliese’
• Solanum tuberosum ‘Blue Belle’
• Solanum tuberosum ‘Blue Danube’
• Solanum tuberosum ‘Caledonian Rose’
• Solanum tuberosum ‘Cara’
• Solanum tuberosum ‘Desiree’
• Solanum tuberosum ‘Elland’
• Solanum tuberosum ‘Golden Wonder’
• Solanum tuberosum ‘Harmony’
• Solanum tuberosum ‘Java’
• Solanum tuberosum ‘Kerr’s Pink’
• Solanum tuberosum ‘King Edward’
• Solanum tuberosum ‘Kingsman’
• Solanum tuberosum ‘Maris Piper’
• Solanum tuberosum ‘Marvel’
• Solanum tuberosum ‘Orla’
• Solanum tuberosum ‘Pentland Dell’
• Solanum tuberosum ‘Picasso’
• Solanum tuberosum ‘Pink Fir Apple’ 
• Solanum tuberosum ‘Rooster’
• Solanum tuberosum ‘Sarpo Mira’
• Solanum tuberosum ‘Setanta’
• Solanum tuberosum ‘Twinner’
• Solanum tuberosum ‘Twister’
•  Solanum tuberosum ‘Valor’

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.