Onion, sets in spring trial 2025

Objectives and purpose of the trial

The focus of this trial is to assess a range of onion (Allium cepa) cultivars grown in spring from sets. The RHS Trials team at RHS Wisley, Surrey, aims to compare, record and display the merits of new and established onion cultivars for garden use and cultivation. Those that perform best will be awarded the RHS Award of Garden Merit (AGM).
Freshly harvested onions drying in the garden
Close-up of fresh onions with rich textures and hues

Judges and criteria

Judging criteria

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

  • Yield
  • Size and shape
  • Colour

  • Skin quality
  • Lack of bolting
  • Storage until March

Suppliers to the trial

List of plants in the trial

View all the onion sets on trial at RHS Wisley
  • Allium cepa ‘Centurion’
  • Allium cepa ‘Corrado’ F1  
  • Allium cepa ‘Crusado’
  • Allium cepa ‘Hercules’ 
  • Allium cepa ‘Jetset’ 
  • Allium cepa ‘Keravel Pink’
  • Allium cepa ‘Red Baron’
  • Allium cepa ‘Red Karmen’
  • Allium cepa ‘Romy’
  • Allium cepa ‘Rumba’ 
  • Allium cepa ‘Setton’
  • Allium cepa ‘Sturon’
  • Allium cepa ‘Stuttgarter Giant’
  • Allium cepa ‘Stuttgarter’
  • Allium cepa ‘Pink Rosanne’
  • Allium cepa ‘Pink Panther’
  • Allium cepa ‘STUR BC 20’
  • Allium cepa ‘Snowball’
RHS Award of Garden Merit logo
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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 trials@rhs.org.uk.

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