Does it give them enough of a head start to make a difference?

I have not had much luck with cannas in the past. By the time they were a foot tall, summer was over. I read here that they like moist conditions, which I don't have much of. (Unless you define clay soil as being moist!) I thought I'd give it one last try. I bought a package of 3. I succumbed mostly because I could see they were already growing in the bag, unlike the dried up ones I bought before that must have taken a very long time to wake up.

Do they take well to potting them up and starting indoors? I do well starting dahlias indoors.

A friend who was shopping with me bought a bunch of elephant ear bulbs, too (Colocasia, the plain green ones). One big one that already had a one inch sprout, and a bag of 4 smaller ones. I said I'd find out if they should/could be started indoors, too. Maybe it would compensate for planting them later into a garden that is not very moist?

Thanks!