I live in southern maine. I did nothing this last year. It was a mild winter and only had a handful of super cold nights. We did have a week of below zeros and single digits and I had two overwinter. It wouldn’t take but a little protection to keep them two years. I planted them in a pallet. Sounds trailer park but they and the cabbage a absolutely thrived in the pallet. Doesn’t take a lot of soil either. Good luck
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