Answer: To some extent the answer will depend on how hard a winter we have, the snow cover and the age of the plants. You might want to experiment both ways and see what works best for you. Snow is a good insulator, but without it, small plants are more subject to heaving in the freeze thaw cycle. They also stop growing when the ground freezes. On the other hand, spinach is hardy and grows well in cold weather as you have seen. Using a poly row cover you may be able to harvest both very late and very early.
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