I live in zone 6/7. For what its worth, I have a Vanessa on the back porch fence. It got really huge, and then one winter it died,or I thought it did. The next year there was nothing. A year later, the vine regrew from the roots. Apparently it was hardier than I thought. If it had not been for my laziness in not getting it dug out, I would never had known that it was not dead, it just lost the above ground wood to the winter. Had I been intelligent, I would have pruned it back and covered it in burlap for the winter. I was too busy worrying about the fruit trees and ignored the grapes.
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