The doctrines of Chinese medicine are rooted in books such as the Yellow Emperor's Inner Canon and the Treatise on Cold Damage, as well as in cosmological notions such as yin-yang and the five phases.
The vegetables you can grow in the winter in Georgia depends on where you live. If you live in the Blue Ridge Mountains up north, the winter temperatures can dive to 0 to 5 degrees Fahrenheit. If you live in the middle of Georgia, you can grow a wider range of vegetables, including Vidalia-style sweet onions.
Of course, in South Florida, you can plant spring vegetables in the fall and winter, up until February or March. Plant early enough so that your vegetables have time to mature before the heat of summer kicks in. See Table 3 in the Florida Vegetable Gardening Guide for planting dates for specific crops. Summer