I was a ponder 10-15 years ago and did the same thing! We only have wildlife and tub gardens here, I have a few unground tubs for the deer, raccoons, etc to utilize for water in times of drought, but I do that in there...I just throw stuff from the greenhouse in there and wait and see what happens. I currently have Costus ginger and Hoffmania growing as aquatic plants in tub gardens. The Aglaonema I put into he greenhouse pond and stream have done so well, really everything I threw in there is...I will have to take some new photos to show their growth.
People also do not realize that you can grow Hedychium gingers, brugmansia, Alpinia ginger and banana trees in a bog...I have a natural bog in a low lying area between my house and the start of the woods (which stretch for miles into a nature preserve) and threw some banana corms, ALpinia (shell ginger), brugmansia clippings and Hedychium rhizomes into it and now have a bog garden with those that I have to do absolutely nothing with, ever. It just grows.
