The Grade II* listed garden in Sussex was founded by Colonel Stephenson R. Clarke in the early 1900s, and filled with plants collected by the great plant hunters from their travels to the Himalayas, China, Burma, Tasmania and the Andes.
In 1965 his oldest son Ralph created the garden charity and opened the gates to the public. His grandson, Andrewjohn Stephenson Clarke, now lives at Borde Hill House and continues to develop and enhance the garden.
Clarke will speak at the celebrations about the garden's history. An exhibition of historical documents dating from the 1900s, which include archived photographs and rare letters to Colonel Clarke from the Great Victorian Plant Collectors, will also be on display.
Visitors in August will see the garden's herbaceous borders and gold standard roses in full bloom. The Paradise Walk has been replanted with late summer colour to delight visitors with kniphofias, salvias, geraniums and asters. The tranquil Italian Garden is also a highlight in August, with its terracotta pots filled with agapanthus and pelargoniums.