Lettuce, butterhead and loose trial 2025

Objectives and purpose of the trial

The focus of this trial is to assess a range of lettuce (Lactuca sativa) cultivars (including butterhead and loose types). This dual trial at RHS Wisley, Surrey, and RHS Rosemoor, Devon, aims to compare, record and display the merits of new and established lettuce cultivars for garden use and cultivation. Those that perform best will be awarded the RHS Award of Garden Merit (AGM).

Bold and colourful lettuce growing in the vegetable garden

Close-up of vibrant red-green lettuce with intricate, ruffled textures

Judges and criteria

Judging criteria

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

• Taste
• Disease resistance

• Yield, including time to maturity, holding ability in the field, shape, density (e.g of heart) for butterhead and loose leaf

Suppliers to the trial

• Thompson & Morgan
• Kings Seeds
• Tozer Seeds Ltd
• Mr Fothergill’s
• Dobies

• Unwins
• Suttons
• D.T. Brown
• Sea Spring Seeds
• Just seed

List of plants in the trial

View all the lettuce on trial at RHS Wisley and RHS Rosemoor

• Lactuca sativa ‘All The Year Round’
• Lactuca sativa ‘Analena’
• Lactuca sativa ‘Artic King’
• Lactuca sativa ‘Ashbrook’
• Lactuca sativa ‘Brighton’
• Lactuca sativa ‘Buttercrunch’
• Lactuca sativa ‘Cervanek’
• Lactuca sativa ‘Clarion’
• Lactuca sativa ‘Frillice’
• Lactuca sativa ‘Grenadine’
• Lactuca sativa ‘Gustav's salad’
• Lactuca sativa ‘Justine’
• Lactuca sativa ‘Lollo Bionda’
• Lactuca sativa ‘Lollo Rossa’
• Lactuca sativa ‘May King’
• Lactuca sativa ‘Mazur’
• Lactuca sativa ‘Merveille des Quatre Saisons’
• Lactuca sativa ‘Navara’
• Lactuca sativa ‘New Red Fire’
• Lactuca sativa ‘Oakus’
• Lactuca sativa ‘Osterley’
• Lactuca sativa ‘Red Salad Bowl’
• Lactuca sativa ‘Rossa di Trento’
• Lactuca sativa ‘Roxy’
• Lactuca sativa ‘Salad Bowl’
• Lactuca sativa ‘Salad Bowl Green’
• Lactuca sativa ‘Saxo’
• Lactuca sativa ‘Smile’
• Lactuca sativa ‘Tom Thumb’
• Lactuca sativa ‘Unrivalled’

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.