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.
The rule of thumb with cover crops is to get them into the vegetable garden when everything else is out. Winter rye planting dates vary from August to October, depending on where you garden. In Zones 6 and warmer, plant winter rye in late fall; in coldest zones, gardeners should get it in the ground in early fall.