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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 up 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.
My climate is alot colder than Virginia. I live in Brighton UK and despite the fact that everyone told me that they would die and not to plant them, I planted them in large pots in my back garden and cut them back after they flowered every year and spread bark on top of them. I have never dug them up or moved the pots inside. Too early to tell now but last year out of 13 pots 10 pots flowered and 2 had no flowers and 1 died. Not bad for north winds and sea air! Happy spring!
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