Naturalised
Several very commonplace trees were first imported here over several hundred years and have become naturalised. Exactly when and how some of them got here is hotly debated by the experts - but man had a hand in all of them arriving.
It was probably the Romans who first began importing exotic trees to Britain and changing our treescape. They imported walnuts, sweet chestnuts and stone pine - all of which have edible seeds loved by the Romans.
By the Middle Ages, there was a constant trading across the Channel and non-native fruit and timber trees were introduced for their economic value.
Many of these trees have been around for so long that we tend to think of them as being native although they are not. For instance the horse chestnut or conker came in the early 1600's from Albania or Greece. European larch arrived about then too and were followed through the 17th and 18th centuries by tree species brought back from faraway places by plant hunters
They include: