With pots of herbs on your windowsill, you can enjoy gardening on the wintriest of days. A pot of green onions and companion pots of garlic and chives will yield tasty stalks for snipping into salads and onto baked potatoes. You'll need a dozen onion sets, 1-2 heads of garlic, a package of chive seeds, a couple of pretty 8-inch pots with drain holes, and some potting soil. (Supermarket onions and garlic will sprout unless they've been treated to retard sprouting. To be sure, try your local nursery.) Plant and place on a sunny sill. Begin snipping when the plants are 3-4" tall. When the weather warms, move your winter garden outdoors.