Our Treefinder lists many non-native species. This while we state to transplant mostly native. This sometimes seems odd. This is because ‘mostly native’ means that the largest number of trees we transplant are native, but we include all possible species that are donated and saved in our list. For example, if you transplant 8,000 (native) birches from the heath and 2,000 non-native shrubs in the city, but those shrubs are of 40 different species, you are transplanting 41 species of which 40 are non-native, but the trees you transplant are mostly native. In the Tree Finder you can see which species are most commonly harvested.