I also live in central VA--Zone 7 and according to packaging labels the Calla Lilies are not hardy to Zone 7. I did dig mine us the first year (about 10 years ago). What a job!! I decided then that they weren't worth it and I would buy new ones every year. Didn't have to buy new ones because they have come back every year since.
In the fall I cut the old foliage down and just leave it on the bed as an insulation. I have so many now that I am giving them to all our neighbors and relatives. This past winter was one of the coldest in many years. I'll just have to wait & see if they come back. If you live any further north than zone 7 you may need to dig them up or treat them as an annual. Sandy, Richmond, VA
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Can I leave my Calla lily outside in the winter?
Becky
RE: Overwintering Calla Lilies
I don't see where you live, however, I live in central VA-zone 7. I have calla lilies which have come back over the last 8-10 years. They say they are not hardy to zone 7, but mine are in a front flower bed facing west. I believe it is because that is the warmest bed with the sun hitting the bed the most year round. I love them. Good luck. (07/13/2009)