What are introduced trees?
Introduced trees, also often referred to as 'non-native’ trees, are ones that have been brought here by humans (as apposed to native trees which arrived here naturally after the last Ice Age).
Although some introduced trees have now been growing here for hundreds and even thousands of years, and have consequently become 'naturalised'.
Weeping willows a familiar site along riverbanks and around ponds, are an example of an introduced tree. Introduced by humans for ornamental reasons many hundreds of years ago from China, they are now a familiar sight in parks, alongside rivers, ponds and in people's gardens.