The Royal Horticultural Society is the world's premier gardening authority. The RHS is a charitable organisation that owns inspirational gardens, holds seasonal plant shows and events, including the famous Chelsea Flower Show, and offers horticultural advice to professionals and amateurs alike. Experts at RHS gardens test hundreds of plants for garden use and try out a range of horticultural techniques so that gardeners can be assured of the best and most up-to-date information.