It all depends on the varieties of ginger you have, David. My White Butterfly Ginger overwinters here, even though we get into the mid to low teens each year. If I were in your zone, I would heavily mulch them, perhaps with 5-6" of oak leaves or pine needles. I also grow Shampoo Ginger and it does not do well, even when mulched. I thought I had lost them all last winter but a handful of tiny plants finally emerged two months later than normal (mid-summer). I dug each one up and potted them. They will go inside a greenhouse this winter.
