Mr. Rawles:
In his book The Winter Harvest Handbook: Year Round Vegetable Production Using Deep Organic Techniques and Unheated Greenhouses, Eliot Coleman has written about his lifelong experience and experimentation with year round commercial farming in snowy Maine. His methods entail no extra heating or lighting, and all produce is grown outdoors during the Maine winter. Specifications include planting schedules.
I have not yet tried Coleman’s winter gardening techniques, but I plan to. His research and experience have convinced me to give it a go this coming winter. My small plastic greenhouse, homemade [planting] boxes, and floating cover are ready to go. Regards, – Deb D.