Following Buckland's spring festival at Powderham Castle in Devon, clematis specialist Marcel Floyd gave him the idea of taking the concept to Bowood House and Gardens in Wiltshire.
Buckland's new garden festivals are designed to champion smaller, specialist nurseries, giving them the chance to reach a wider audience, and gardeners the opportunity to meet the growers and get advice from the experts.
Rosie Hardy, of Hardy’s Cottage Garden Plants, said: "If you want to create a perfect English garden or even a tropical forest, you’ll find it here. Specialist nurseries know there are customers out there looking for the interesting and unusual. It’s fantastic to gather them in one place to find plants that you won’t find anywhere else."
Bowdens, Floyd’s, Whetman Pinks, Kelways, Heucheraholics and Pennard Plants are among nursery exhibitors.
Roy Lancaster, James Wong, Anne Swithinbank, Jim Buttress and Jonathan Moseley are among the speakers.