I am a young adult that lives in New England, zone 5, and while I have had fish tanks for about 2 years, I just got permission to set up a water garden this year. Said water garden will be an above ground giant flowerpot (not giant by pond standards, alas...both a good and a bad thing) on the east side of the house, containing water hawthorn, hornwort, an aquarium lily species (to provide flowers in the summer when the hawthorn is dormant), and perhaps some other plants and a few fish. The pot is going to be above ground...thus, the fish and lilies will likely only be in the pond for the summer months (the hornwort and hawthorn should be able to be in there at least from mid spring to mid fall, I believe...please correct me if I'm wrong, I'm new to this! :) If I used an electric water de-icer to keep the pot liquid the entire year, could I keep the hawthorn and hornwort out year round?). Anyhow, thankx for any replies!