I went to the local state park today and I happened to collect some local plants. All of them were submersed when I collected them. I have never seen any of these plants before and I'm going to try to grow them submersed and just see what happens. The moss was very interesting. It would cling to rocks right at the water line and grow in and out of the water. Any help on the kind of plants would be excellent. I live in Alabama so I guess these plants are native to this area unless they were invaders. Here's some pics: