Episode 18

After the scorching heat of early summer, Monty is working to keep the garden looking its best through the season's challenges. He tackles essential jobs, including cutting back perennials to make room for more colour, tending long grass and pruning step-over apples, while proving there's still time to sow vegetables for delicious late-summer harvests. Best of all, he enjoys some of summer's greatest rewards – lifting the first new potatoes and gathering fragrant sweet peas for the house.

Adam Frost discovers a remarkable 2.5-acre walled garden in Surrey packed with hidden gems and unexpected delights. Sue Kent demonstrates how imagination and resourcefulness can transform everyday items into beautiful and productive growing spaces, while in Cornwall, there's a fruit and vegetable professor whose lifelong fascination with pests and diseases is helping gardeners grow healthier crops. Plus a visit to a grower with a striking collection of crassulas, showcasing the extraordinary beauty and diversity of these popular succulents.