Trials are normally grown from plants (as opposed to seed, unless the plants are propagated mainly from seed; this is indicated in the list) submitted by nurserymen, individuals, breeders etc (the senders to trial) and are open to visitors to RHS Garden Wisley except for those grown in restricted areas.
Scroll to the bottom of the page to view details of month-by-month listings of trials to go and see.
Click on the links for each trial to view a list of the species/cultivars that are under trial.
To view these documents you will need a copy of Adobe Acrobat Reader. We strongly recommend that you download the latest version to prevent problems viewing the documents. This is available free from the Adobe website. Click on the logo to go to the website.
Floral
From seed; on trials field
Amaranthus with Celosia 2009
Digitalis biennial and perennial 2009-2010
Annual climbers 2009
From plants; on trials field
Bergenia 2007-2009 (95KB)
Cortaderia 2007-2009 (54KB)
Galega 2009-2011
Phlox 2009-2011
In the glasshouse
Fuchsia, Triphylla hybrids 2008-2009 (11KB)
Begonia, trailing, for containers and hanging baskets
Rock garden plants
Crocus, spring-flowering 2006-2010 (98KB)
Roscoea 2009-2011 (also at Harlow Carr) (75KB)
Woody plants
Abelia 2004-2009 (16KB)
Berberis thunbergii 2005-2009 (18KB) (limited public access)
Clematis Viticella Group 2009-2011
Desmodium, Indigofera, Lespedeza 2008-2010 (16KB)
Hydrangea paniculata 2008 (21KB)
Lonicera (climbing/deciduous) 2006-2010 (17KB) not open to the public except on Open Days)
Ribes sanguineum 2009-2012
Buddleja 2008-2010 ( 19KB) (Euro-trial)
Weigela coloured-leaved 2009-2010 (19KB) (Euro-trial)
Vegetables
Asparagus from one-year plants 2008-2011 (10KB) (also at Rosemoor)
Cabbage, autumn, including reds to crop September to October
Cucumber, in unheated plastic tunnel (also at Rosemoor)
Endive for fully mature cropping (also at Rosemoor)
Leeks, late to crop spring 2009 (16KB) (15 of the colourful cultivars also at Rosemoor)
Parsnip, for October and February assessment (14KB)
Pea, mange tout and sugarsnap (also at Rosemoor)(14KB)
Sweet corn (excluding normal sugar types) (12KB)
Demonstration of rhubarb, melon and watermelon
Fruit
Raspberry 2007-2009
Also evaluation of collections of: apples, blueberries, cherries, plums, greengages, gooseberries, grapes, pears, figs
RHS/National plant society trials
Long-term trials
Border carnations (26KB)
Chrysanthemum, garden (29KB)
Chrysanthemum, under glass (23KB)
Daffodils 2008-2009 (79KB)
Daffodils 2009-2010 (14KB)
Daffodils AGM 2009-2010 (26KB)
Dahlia (41KB)
Delphinium (12KB)
Dwarf pinks (79KB)
Garden pinks (82KB)
Iris, bearded Second of three-year trial (78KB)
Iris, Pacific Coast Second of three-year trial (27KB)
Iris, tall bearded Last of three-year trial (22KB)
Iris, moisture-loving, First of three-year trial
Iris sibirica First of three-year trial
Iris spuria Last of three-year trial (15KB)
Perpetual flowering carnations 2007-2009 (238KB)
Perpetual flowering carnations 2008-2010 (9KB)
Perpetual flowering carnations 2009-2011 (24KB)
Sweet pea (22KB)
What to see under trial
Find out which trials are looking good month-by-month. This will help you decide which trials to go and see and when.
RHS Trials and the Award of Garden Merit (380KB)
Download an Adobe Acrobat pdf of the list (28KB)
Don't forget the Trials Open Days at RHS Garden Wisley. Download the programme of events here (10KB)
Last year we asked you to vote for your favourite dahlia and there was one clear winner.
Click here to see the results (27KB)
We also asked you to chose your favourite buddleja
Click here to view the results (30KB)