We have a couple of smallish ponds on our property. Already have cattails, and we enjoy them in a couple of different ways. Also going to transplant some wapato into the ponds this year. There was a recommendation for Samuel Thayers books here, and we bought both of them. Great books. Buy them for the info on acorns alone.
He also has alot about wild rice. I see you can buy plants and seed on the internet (can't seem to find any growing wild here in upstate NY) that goes in after 9/15.