The target trees include nine different species. All were selected by borough foresters as historical for having existed for at least a century - either as fixtures of the urban landscape or as having special significance to local communities.

• 将被克隆的树包括九个不同品种。由各区林务员挑选出的所有古树的树龄至少为100年。这些古树有的是城市景点，有的则对当地有特殊意义。