Most gardeners don’t utilize their backyard during the winter season because they don’t know what to grow. However, did you know that winter plants like spinach, kale, and escarole can actually do well in winter?  In my career as a garden writer, I have come to know that it is possible to grow cold-hardy crops as much as other crops.
Well, the secret lies in using winter tunnels. For instance, spinach does well during the cold season because it increases its sugar content in the vasculature and this serves as an anti-freeze to protect it.
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