I have been thinking about trying to grow a few plants as an experiment. I was wondering if I could get a large sheet of Styrofoam and cut holes in it for pots. Then float it out in my farm pond to grow the plants. There should be plenty of nutrients in the water. I'm not really worried too much about how much I grow since I already have a large garden. I figure if it works good I might build me a greenhouse later and pump water from the pond to use in growing plants in the winter.