Countryfile launches Plant Britain, an ambitious two-year challenge aimed at galvanising everyone in the nation to get planting.

Matt Baker is in Cheshire, planting the very first trees in what will become the Countryfile Plant Britain wood, while Anita Rani is in her home town of Bradford, helping residents of the Canterbury Estate to plant trees in their front gardens and at the local primary school. Anita is also on her home turf in Hackney, discovering how her local area is going green with help from voluntary organisation Tree Musketeers.

Margherita Taylor is at Wytham Woods in Oxfordshire, discovering exactly how trees capture carbon. Steve Brown is in Neath, south Wales, to learn which trees to plant in which location, while John Craven discovers a micro-forest close to his home and plants a simple window box to demonstrate how you can still do your bit even if your outdoor space may just be a window ledge.

John Craven visits Westonbirt, The National Arboretum, in Gloucestershire, to see it in all its autumnal glory. At this time of year, 2,500 different species of trees, from around the world, burst into a mosaic of colour.

John finds out about the history of the arboretum’s autumn colour parties, which were celebrated in the Victorian period, and discovers why leaves change colour at this time of year. He meets the team saving the arboretum's older trees from the winter storms and plants a rare native Sorbus tree to help preserve the species for the future. In celebration of the season, we also delve into the Countryfile archives to revisit autumn stories from around the UK.