Christine Walkden's airborne adventure takes her to Cornwall; at the tropical paradise that is Trebah Garden, she is transported back to childhood by the giant Brazilian gunnera and meets Marcus, whose own childhood was spent playing in the garden.

Christine experiments with triangular planting and shares tea and cake with a gardening legend; at RHS Hyde Hall, she shifts rocks with a former student, and it's all aboard a vintage Thames sailing barge for a trip on the Blackwater Estuary.

Christine heads to Powis Castle Garden, where she learns how to brace a yew, and visits Dingle Garden, where she helps restore an obscured view; she also hears the story of Mona Holloway, a wartime land girl who found love on a neighbouring farm.

The county of Yorkshire is the setting for Christine Walkden's balloon tour of Britain; at Scampston Hall she discovers two superstar garden designers and meets young gardener Nathan, who is just starting out.

Christine Walkden takes to the skies above Sussex; she drops in at West Dean Garden to see the fruits of a 20-year labour of love; at Arundel Castle Gardens, she is astonished by the transformation of a former car park into an Italian garden.

Christine Walkden takes to the skies above Oxfordshire to explore the county's gardens; she visits Waterperry, where the gardeners are the custodians of a formidable legacy, and chats with Mary, the first woman to present `Gardeners' World'.