Cannas are easily adaptable to different climates, I still think they don't do good for you because the plants you had were not healthy to begin with.
I pulled the ones I want to save (don't have room for all) in the Fall, put the rhizomes in boxes of pine shaving and store them in the only unfinished little spot of the basement, where my water softener is.
Yes, I bought a non-starter and those raised from seeds bore pathetically small flowers. Pine shaving! I wonder if the shavings in our packets are pine shavings. They are shavings all right. I am a bit wary as those plants that I bought from shops differed dramatically to those flowered last year. Of course, the weather was atrocious last year and the heat and drought were just relentless.
Did you buy them online, Gemma? I have never seen these before! Thank you for sharing your pride and joy. Tomorrow is going to be a very busy day! Too much to tidy up and we need to buy a lot of stuff for painting. Vinyl matt emulsion and all that.