Conservationists are working to secure the future of the black poplar in North Yorkshire, one of the UK's rarest native timber trees, with only around 7,000 remaining across the British Isles.

The British Isles are home to only 30 native tree species, and some of the rarest, such as the Plymouth pear and Arran ...

The Forgotten Flora project is working with the North York Moors National Park to grow black poplar saplings from cuttings of the surviving trees.