Making two visits to one of our cold greenhouses ─ one at dawn after a below-zero night, and the other a few hours later ─ provides a striking introduction to the winter harvest. During the dawn visit all the crops are frozen solid. Raising the inner covers, which is difficult because they too are frozen, reveals a sight of hard, frost-coated leaves bleak enough to convince anyone that this idea is foolish. Yet a few hours later, after the sun has warmed the greenhouses above freezing, the second visit presents a miraculous contrast. Under the inner covers are closely spaced rows of vigorous, healthy leaves that stretch the length of the greenhouse. The leaf colors in different shades of greens, reds, maroons, and yellows stand bright against the dark soil. It looks like a never-ending spring.