Make sure your plants are out of drafts and in the brightest spot possible.
Increase humidity by sitting groups of plants on trays of pebbles. Add water to the pebbles (but not deep enough to soak into the roots of the plant).
If, back in September, you started your Christmas cactus and poinsettias on a regime of 14 hours of darkness per day, you can bring them out now into a bright spot. They should be kept relatively cool and away from heat sources and drafts. Don’t overwater.
Keep houseplants free of dust. Wipe glossy-leaved plants gently with a sponge, and lightly rinse other plants in the sink or tub with a fine spray of water.
Reduce fertilization of houseplants.
If you receive plants as gifts, poke holes in the gift foil and sit on a tray to allow for drainage.
Cleanup and Maintenance
Continue adding mulch to trees, shrubs, and planting beds.
If the ground does not freeze in your climate, you can address drainage issues by burying drainage pipes, routing downspouts, and installing French drains. The winter landscape often makes it easier to spot drainage issues.
Cold wind and rain can wreak havoc on garden tools. Bring them indoors and be sure to clean and oil them thoroughly.