A spinach and a few other crops can be grown in an unheated greenhouse, in Wisconsin and into Canada, through the winter.
The spinach will freeze at night. During the day, when the greenhouse warms up, you can pick the fresh spinach. Just don't try to pick it when the plant is frozen.
From more on this see Eliot Coleman's "Four Season Harvest" book at
http://www.fourseasonfarm.com/
Good luck,
Roger
INFILTRATING LANDSCAPES, Consulting provides Sustainable landscaping design, installation and related presentations and works with schools and progressive communitees to demonstrate low-maintenance gardening techniques. Motto: "Less Work--More Produce!" Submit your blog questions to: InfiltratingLandscapes@gmail.com
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