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‘The Royal Horticultural Society Horticultural Database’, available at www.rhs.org.ukType the name of a plant to see details of any trials carried out on its cultivars. Tip | for ornamentals, try entering a botanical genus name, e.g. ‘Penstemon’
Use these lists to find which plants are being assessed
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© The Royal Horticultural Society 2011 / RHS Registered Charity № 222879/SC038262