Monty Don gives advice on what to plant now for spring and finds out more about the mysterious world of earth worms and why they are vital for the garden. Adam Frost shares plans for his own garden, while Toby Buckland discovers a garden in Scotland where contemporary planting has been the solution to challenging climactic conditions. Flo Headlam visits a project where gardening has been prescribed by a doctor to help improve mental health, Joe Swift attends the Malvern Autumn show, and the programme visits a small garden in Kent transformed into an exotic jungle paradise.