Swift will be at the Powderham Castle on 30 April.
Returning to Powderham is Christine Walkden on 29 April.
The Toby Buckland Garden Festival at Bowood House in Wiltshire is to become a Saturday and Sunday event in 2016 switching to Saturday 4 and Sunday 5 of June. Charlie Dimmock will be at the Bowood Festival on 4 June speaking and demonstrating on her specialist subject -water features.
Powderham Castle Event: Friday 29 April & Saturday 30 April 10am-5pm
Bowood House Event: Saturday 4 June & Sunday 5 June 10am-5pm