The RHS is the International Registration Authority for nine groups of cultivated plants and, as such, publishes the official registers or checklists of names.
All are in paperback binding with the exception of the Sander's List of Orchid Hybrids which is in case-bound hardback volumes. When purchasing any of the main Registers, it is advisable, to ensure complete coverage, also to buy all available supplements or addenda.
The prices do not include postage and packing costs - please contact the following for more information and to place an order:
RHS Enterprises Ltd
RHS Garden Wisley
Surrey GU23 6QB
Tel: 0845 260 4505
Some of the latest supplements are also available as a download in Adobe Acrobat (pdf) format.