Seed germinating tip & easy overwintering success
This has probably been mentioned somewhere, but here's a tip for helping to germinate canna & other hard seeds. Scratch or clip a small tip of the seed. With canna seeds I scratch the seed w/ 60 grit sandpaper until I start to see white. I soak the seeds for a few days in a small bowl of water w/ some hydrogen peroxide - maybe 10-20%??? When they start to puff up, put them in seed starting mix - unless you live in a warm climate....I hear some do this with palm seeds.
With another hard seed, moonflowers, I just clip a corner with toe nail clippers and soak in water(only) overnight and before putting in seed starting soil mix.
Incedently, This was my first year overwintering cannas indoors. I simply just dug a couple up and put them in a large "contractor" garbage bag - dirt and all. I removed just a little dirt to make it lighter. Very simple & goofproof...Watered very lightly once a month (since mid Oct). They look great with several shoots coming up even in the dark. I have been doing the same with banana plants for nine years now. Cannas are much easier...