Keep a close watch on your houseplants for insects this month.
Plant your spring flowering bulbs now if you haven't already. Bulbs do best in full sun or with at least 6 hours of direct sun and prefer well drained soil. To much moisture will rot them.
Clean up any yard debris. Rake out old fallen leaves from around your shrubs were pests and insects can overwinter. Exposing them to the cold winter days will kill them. You can add a nice layer of mulch afterwards.
When buying your poinsettias for the holidays, look for ones with tight center buds. Keep the soil moist but not wet and place in a warm, draft-free area.
If you purchase a cut Christmas tree, make sure to get a fresh cut on the trunk. It will help the tree to be able to drink up the water better. Always keep fresh water in the tree stand and don't allow it to dry out. Turn off your lights at night before bedtime or when you are away to prevent any fire hazards.
Keep all your annual winter flowers deadheaded. Preventing the flowers from seeding will help in producing more blooms.