Thanks Annette, I just stuck them in some potting soil about 3 years ago. I didn't soak them or do anything special before planting but it may have been a good idea if I would have. I had about 10 different pots with 10 different types of canna seeds. 4 pots came up that spring, another 2 came up the following spring and believe it or not another pot came up this spring
canna seeds must stay viable for a long time in the soil until conditions are right for germination. If you do try growing cannas from seed don't give up if they don't sprout right away and don't reuse the soil from any unsprouted canna seedlings because you never know when they will decide to sprout