The idea that we would use random natural selection for urban trees feels archaic. We don't use natural selection for our crops or livestock or much of anything any more.

Urban trees will almost assuredly, like all of the other lifeforms we grow and rely on, be altered through human selection (be it simple old techniques like cross breeding, or advanced techniques like genetic modification)

i.e. https://en.wikipedia.org/wiki/Genetically_modified_tree