Turnips may survive your winter and produce seed next year. They do not survive my zone 5 winters. Shogoin variety will survive my winters but I do not like its root. A white Japanese type that makes a big ugly root.I picked all my turnips this morning and got all the greens into the freezer. The turnip roots weren't worth trying to clean up enough to eat - too much insect damage.
So, I decided to try replanting all the turnip roots in hopes of getting another nice crop of turnip greens. Maybe doing this will be better than trying to plant seeds to get more greens before it freezes outside.
I loosened the ground and mixed in some chicken compost before I replanted the roots. I made sure that the cut off tops of the roots were above ground, thinking sunlight would encourage them to grow faster. Fun little experiment! Hope it works.
If it doesn't, that's ok because I have 18 red Russian kale plants that are doing well since I set out the plants last month. Those should provide plenty of greens.