If you are going to dig out and thin out your canna, I would like to get some. I can offer to trade for bearded irises or flower/vegetable seeds.
You might try posting in the EXCHANGE section of this forum. There is not a lot of traffic there but it is not as likely to be bumped down and buried quickly.
I have some tall yellow cannas probably Richard Wallace.
What color are your bearded irises?
I have seeds from yellow cannas if you're interested