Tropicals & Tender Perennials: What about this canna?, 1 by saya

saya wrote:
I've grown this canna from seed this year. Did'nt expect blooms this year allready. The flowers are smaller then I'm used to. Do they have bigger flowers next year when they are more mature? Last winter we had frosts down to -20C. Is this Canna hardy enough? She's pretty and I don't want to loose her. I got seeds from a big seedswap. This one is called Canna Indica. Is it?
I hope I've posted this on the right forum.
Thanks,
Saya