Get advice from some of the country's best professional gardeners in this ongoing series from the National Trust. This month, learn about lifting dahlia tubers from Chris Wilson, Senior Gardener at The Vyne in Hampshire. Find out more about gardening from the National Trust at: https:www.nationaltrust.org.uk/gardens Or discover The Vyne at https:www.nationaltrust.org.uk/vyne Music: Summer by Moby