Overview: Diarmuid Gavin wants our gardens to become havens for wildlife. He visits a RSPB nature reserve in Yorkshire to understand how important our gardens are to Britain's wildlife population. He meets a group of gardeners at one of the country's only chemical-free community wildlife allotments and encourages the people of Sheffield to grow wildflowers in their gardens to attract pollinators by giving them a taste for flower flavoured honey. Charlie Dimmock is determined to make the peony the star of our beds and borders again. On her revival she visits a nursery in Somerset - one of the oldest in the UK - which has been championing peonies for over 150 years and she sets up a pop-up peony stall in a Bristol market to spread the word about her campaign.