Geraniums are beautiful plants that tend to die in the winter months without proper care. Container geraniums are a little easier to deal with; however, even they can become a bit overgrown or sickly if not treated well. Winter care of these plants is not overly complicated and will keep your plants vigorous until the spring.
Bring container geraniums inside during the winter months before the first frost. Frostbite will cause the leaves to curl up and fall off. Frost may also damage the plant past the point of recovery.
Spray the plant with a general insecticide to keep insects from entering the house with the geranium. Use a light spray of garlic oil if you prefer not to use chemicals.
Place the plant in a well-lit area and maintain a temperature of around 70 degrees F in that area.
Trim the geranium by cutting 3 or 4 inches of new growth off the plant. Cut at a joint where a leaf has formed if possible. The plant will ultimately grow fuller for the spring. Prune before the end of winter so the plant will have time to grow back out. Root the cuttings in a sandy, damp soil if you wish to propagate the plant.