RAH, the Thalia Dealbata should be hardy north to zone 6. Some places even say to zone 5. We'll see how they do in my zone 6. Ohio appears to be mostly zone 6. I would guess that there are many varieties of water cannas, so I am only speaking of the rather non-showy Thalia Dealbata. I have never had them, just read about them a bit and thought I'd give them a try.
