Leek, autumn and winter trial 2026

Objectives and purpose of the trial

This trial will look specifically at leeks (Allium porrum), which have not been reviewed by the RHS since 2015. Sown in spring, they develop steadily through summer and autumn, providing reliable harvests throughout the colder months. They can also be lifted earlier as sweet, tender baby leeks, adding to their versatility in the kitchen and garden. This trial at RHS Garden Wisley in Surrey, gives the RHS Trials team the chance to assess a wide range of cultivars, including some current award holders. The strongest performers will be recognised with the RHS Recommended: Award of Garden Merit.

Leeks showing off their blue‑green leaves in a tidy veg patch

Leeks growing strongly in neat rows across freshly worked soil

Judges and criteria

Judging criteria

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

• Length
• Colour
• Sturdiness

• Bolt resistance
• Plant health

Suppliers to the trial

• Dobies
• D.T. Brown
• Johnsons Seeds 
• Kings Seeds (EW Kings & Co Ltd)
• Marshalls Garden

• Mr Fothergill’s
• Pro-Veg Seeds Ltd
• Suttons
• Thomson & Morgan
• Tozer Seeds Ltd

List of plants in the trial

View all the leeks on trial at RHS Wisley

• Allium porrum ‘Ascot’
• Allium porrum ‘Autora’
• Allium porrum ‘Batter’ F1 
• Allium porrum ‘Below Zero’
• Allium porrum ‘Blauwgroene Winter Bandit’
• Allium porrum ‘Blue Solaise’
• Allium porrum ‘Chefs White’ 
• Allium porrum ‘Chinook’
• Allium porrum ‘Falcon’
• Allium porrum ‘Gladius’ 
• Allium porrum ‘Impala’
• Allium porrum ‘Jolant’
• Allium porrum ‘Kicker’ 
• Allium porrum ‘Lancaster’ 
• Allium porrum ‘Longbow’
• Allium porrum ‘Prizetaker Lyon’ 
• Allium porrum ‘Malibu’
• Allium porrum ‘Mammoth Blanch’
• Allium porrum ‘Mercurian’
• Allium porrum ‘Moravin’
• Allium porrum ‘Musselburgh’ 
• Allium porrum ‘Norwich’
• Allium porrum ‘Nottingham’
• Allium porrum ‘Oarsman’
• Allium porrum ‘Odrin’
• Allium porrum ‘Porbella’ 
• Allium porrum ‘Santora’
• Allium porrum ‘Sprintan’ 
• Allium porrum ‘Stromboli F1’ 
• Allium porrum ‘Tadorna’
• Allium porrum ‘Terminal’ 
• Allium porrum ‘Warwick’

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].