Hey Matt,
The Upsidedown tree is a Baobab (Adansonia digitata). Found in Africa and a few other places. Its a very cool tree. I have a couple of pics. The trunks can get to 30ft in diameter. Perfect bonsai shape. They are also very easy to germinate.
So if I want to start a seed exchange do I just start a new thread in the Propagation folder? And if I do will you spread the word?
Thanks,
Brian
