Old Age

The concluding episode reveals how trees can extend their lives by 'walking' across the land and planting new roots. Plus, how they can 'learn' from trauma, and how a decaying tree has the miraculous ability to nurture new life. In Scotland, Tony Kirkham explores a magical collection of Yews - the UK's longest living trees. He also explores a grove of Monkey Puzzle trees, and explains that the unusual, scale-like leaves of this prickly species are an adaptation to protect it from hungry dinosaurs.