getting greens to survive the winter isn't overly difficult. Getting them to grow through the winter can be hard. They need to warm up during the day to grow. A greenhouse can help with this.
For kicks last winter I planted lettuce, carrots and beats in a front garden where I knew they would be sheltered from the worst of the weather and should survive. The did survive but didn't grow a bit from mid october until late march. I think with a small poly tunnel they'd have kept growing at least another month probably right through.
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