Monty Don and the team focus their attention on the loss of wildflower habitats in the UK and the part that gardeners can play in averting the resulting loss of wildlife. In Lincolnshire, Adam Frost finds out how crucial meadows are to supporting the ecosystem, Arit Anderson visits East Sussex to discover the results of a recent wildlife survey carried out in the gardens there and Nick Bailey travels to Staffordshire where meadows are being grown in gardens for the benefit of wildlife. Plus, Carol Klein identifies plants that can help increase insect and bird populations.