Get advice from some of the country's best professional gardeners in this ongoing series from the National Trust. This month, learn about propagating strawberries from Heather Aston, Head Gardener at Upton House and Gardens in Warwickshire. Find out more about gardening from the National Trust at: www.nationaltrust.org.uk/gardens Get more tips from Heather at: www.facebook.com/UptonHouseNT Or discover more about Upton House and Gardens at www.nationaltrust.org.uk/upton Music: Summer by Moby