I recently used Cairns city council's exhaustive tree map to match and identify a beautiful weed tree that had popped up in my front yard (to a tree in a nearby park). Turns out it's actually an edible fruit tree (a damson plum) so we've kept it. Tho it's already quite big and will start taking light from the mango tree soon enough, so decision is akin to an adoption!

By weed tree, I mean planted by a bird.

https://www.cairns.qld.gov.au/community-and-environment/tree...