If you plan to grow your own plants, remember that some like petunias and snapdragons should be started in late February, another incentive to ordering early. January is a good time to do some container gardening. Instead of buying terra cotta pots, go on a treasure hunt in your attic, basement, or a local flea market for unusual and interesting containers. For example, you can place a small pot of ivy in a vintage ankle-high boot. Or fill a small suitcase with a variety of potted plants, placing the taller ones in back.
Drainage also can be a problem.
For best results, you should make a small hole at the bottom of the container to allow water to run out. If that's not feasible, place a shallow layer of pebbles on the bottom of the container, than plant in small pots and place these in the container. Dry heat, varying amounts of light, and too much attention all contribute to houseplant troubles in winter. Poor light, chilling, too much water, or not enough drainage can cause yellowing or drooping leaves, as will root decay from soil-borne diseases or insect pests. Use a soil-less mix of vermiculite and perlite, and choose a pot the next size bigger for replanting.