I'm currently trying to gather everything I can about upside down growing. This includes growing tomatoes, strawberries, and cherries upside down.
I have not personally dabbled in growing upside down trees (mainly because I dread the thought of having a 50lb. apple tree hanging upside down, but... I suppose).
Therefore if you want anything added here, please let me know! I'm currently working on finding instructions for every type of upside down plantable plant that I can find as soon as I do find them to the front page.