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After months of nurturing the plants in his garden, Monty reaps a harvest of a different kind when he investigates how productive his bees have been at making honey. Joe Swift visits the world famous Chatsworth House in Derbyshire to explore the history of its monumental 19th-century rock garden and to see how a more contemporary version compliments the original design . Frances Tophill explores the challenges of gardening on the edge of a Scottish loch, while Flo Headlam is in Birmingham, transforming a city rooftop. Adam Frost continues with the transformation of his Lincolnshire garden, Alan Power spends a day with the head gardener at the Bishop's Palace in Wells, and Zephaniah Lindo is in Yorkshire, looking at research into how light can be manipulated to change the way plants grow.