The stories of people who have entwined their lives with trees

From golden larches in Greenland to a collection of more than 300 oaks in Southwest France - people come to collect trees for all sorts of reasons.

Tree collections are used for healing wounds of the past, for art, education and simple curiosity. Author Amy Stewart has found and documented some of their stories from around the world. One man grafted 40 different varieties of stone fruit on to the same tree. Amy is no stranger to the natural world - her previous book The Drunken Botanist charts the plants behind the world's most famous cocktails.

And in her latest work The Tree Collectors she taps into the deeper reasons people collect trees, and illustrates it with her own watercolour art.