I had a thread going in this forum about the same thing. Thread is called "Growing leafy vegetables on a pond on a foam raft".
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Main=37211&Number=486419#Post486419 I currently have a small experiment going where I am floating nine net pots on a high density foam raft in my forage pond, by inserting the pots into sawed holes. It has some kale and lettuce going. If this works well, then I will go larger eventually.
I don't want to spend very much on it until I find out if it works.
I have an identical control group of plants growing in my garden.
This experiment started only two days ago.
If anyone else is interested, I will periodically post results to this thread.
