But what about actual fresh vegetables in the winter? For that, we need to reference the amazing work The Winter Harvest Handbook by Eliot Coleman. Coleman lives in Maine. He uses unheated greenhouses. In the winter. Here is how his system works: A single coat of greenhouse plastic and the thinnest row covers.
The traditional method of understanding nutrition consisted of the macronutrients of carbohydrates, proteins, and fats. Carbohydrates are energizing; proteins are fortifying; fats are lubricating—to put it basically. New nutrition understanding is pointing to a fourth food source deserving of a prominent place alongside the other three (though comprised of the first three elements) –Green Foods.