canna seeds

The only cannas I've had that have set seeds are the "wild" (smallish flowers, very tall stalks) ones that grow all over New Orleans. There also is an orange and a yellow variety. None of the fancy ones I have with seed pods have produced seeds--I've been told that due to an unusually wet year any canna that is the slightest bit finicky has had its seeds refuse to develop.

zemedelec

I don't think it would be worth starting cannas from seed. The rhizomes generally multiply like rabbits. If you are in zone 6 or below, you should dig the rhizomes after the frost gets the foliage and store them in a cool place (above 45F). No doubt when you dig the rhizomes you will have two or three times more than you planted. After a couple of year you will be begging people to take some. There are usually people here who are willing to trade rhizomes if you want different varieties. You can also buy more at a reasonable price from