Finally got around to planting my tubers today. In the process, noticed a lot of seed coming up. More imporrtantly, I discovered 3 tubers that got left in the grown and the overwintered! Admittedly, we had a very mild winter. But this WAS a first for me. Zone 5B.
But what the heck - I have cannas that have now been in the ground pushing 6 years. ~ 20 of them.