You may not think of winter as the ideal time of year to grow vegetables, but for some plants in warmer climates, this is the prime season. Beets, broccoli, cabbage and a number of other veggies can grow best in the winter -- as can some perennials, such as artichokes, asparagus and garlic. But they sometimes need a little help during the colder months. One option is to keep homegrown produce and herbs warm under a roof overhang called a cold frame. This insulating structure latches open and is a good way to extend the growing season into the winter. If you keep plants in pots, simply move them indoors or to a warmer area when frost threatens. You can also cover plants with tarps, blankets, towels or plastic until there's no longer a risk of frost.