How to enter plant trials
The RHS plant trials have been held since the foundation of the Society. The aim is to identify good reliable garden plants by assessing a number of cultivars from a particular group. The best performing plants receive the Award of Garden Merit (AGM) .
Trials and AGM demonstrations are held across all four of the RHS gardens.
The Society designs a trials programme which includes herbaceous perennials, flowers from seed, vegetables, fruit, rock garden plants and woody plants.
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Alstroemeria 2010 - 2012
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Indigofera, Desmodium and Lespedeza 2008-2011
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Argyranthemum 2011
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Iris ensata 2010-2011
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Asparagus 2009-2012
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Iris - Median Bearded 2010-2012
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Bean, French dwarf
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Iris Pacific Coast 2010-2011
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Blackcurrant 2009 - 2012
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Iris sibirica 2010-2011
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Campanula 2010-2013
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Leaf beat and chard (Off site)
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Carnation, perpetual flowering (offsite)
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Lobelia in containers 2011
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Celeriac 2011 (offsite)
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Lonicera, climbing, deciduous 2008-2011
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Chrysanthemum - hardy 2010-2012
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Meconopsis 2010-2013 - Harlow Carr
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Clematis Viticella Group 2009-2012
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Phlox 2011 - 2012
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Daffodil & AGM display
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Ribes sanguineum 2009-2014
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Daffodil, mini and large 2010-2011
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Roscoea 2009-2011
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Dahlia 2010-2012
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Spring cabbage 2010-2011
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Delphinium 2010-2013
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Sweet pea 2010-2012
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Miniature and dwarf pinks 2011-2012
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Vinca 2011-2013
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Erythronium 2011-2013
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Weigela coloured-leaved 2009-2012 (plus Euro-trial)
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Garden pinks 2011-2012
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Border carnations 2011-2012
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The trials programme for 2012-15 is already taking shape with proposal from across the trade and the trials assessment panels.
Please contact us for further information at:
Horticultural Trials Office, RHS
Garden Wisley, Woking,
Surrey
GU23 6QB.
Tel: 01483 212440
Email: trials@rhs.org.uk
Updates and news throughout the year can be found on this website and detailed results of all completed trials can be found in the final reports on the trial database and full colour trials bulletins which are available as downloads.