Q.When to plant Canna Lily bulbs
I live an hour East of Atlanta, GA and I would like to know the best time to plant canna lily bulbs? I am guessing it is the spring. If I plant established plants, can I plant them in the Fall?
Thank You!

Yes, plant canna bulbs in spring after the last frost date in your area. Even with established plants, they will be able to establish more strongly if planted in spring. Since you are likely in zone 7 or 8, cannas are winter hardy in your region, so you won't need to dig the bulbs up in the fall.
https://www.gardeningknowhow.com/ornamental/bulbs/canna/canna-lily-care.htm