Cold houses and winter vegetables

Coming back from winter break, I've been amazed with the productivity of our winter vegetable gardening experiment in the unheated teaching greenhouse (the Sprouting Wings Greenhouse).

Wow.

Kales, lettuces, and spinach

a flourishing mesclun mix

With no heat, regular poly/hoophouse covering, and plastic water-filled barrels as a heat source, these greens have not only survived, but they've thrived and grown.