4. RHS Garden Wisley, Surrey
As the flagship garden of the Royal Horticultural Society (RHS), Wisley is a paradise for plant enthusiasts. Situated in Surrey, it features a diverse range of gardens, including the iconic Glasshouse, the exotic Tropical Zone, and the vibrant Mixed Borders. The garden’s educational displays, beautiful plant collections, and tranquil water features make it a haven for horticultural enthusiasts.