An ancient tree is one that is in the final stage of its life and is exceptionally old for its species. Such trees typically have a wide girth and a hollow trunk with decaying wood, holes, and cavities that provide crucial habitats for thousands of species, including 25% of England’s priority conservation (‘Red Book’) species. The late Oliver Rackham – who regarded trees and woods as living archaeological artefacts, revealing much about historical landscape management practices – stated that ‘a single oak 400 years old is a series of ecosystems in itself, for which a hundred 200-year-old oaks are no substitute.’
Britain is thought to have the greatest number of ancient trees in northern Europe, and the Ancient Tree Forum (ATF), in common with other campaigners for these irreplaceable ecosystems, believes that they should be listed, like historic buildings and ancient monuments.
Lacking formal legal protection, they are vulnerable to vandalism (the fate of the Hadrian’s Wall Sycamore Gap tree), development pressures, and felling in the mistaken belief that such trees represent a health and safety hazard – as in the case of the 500-year-old ancient oak beside a Toby Carvery in Enfield, cut down in April 2025.
