Geraniums are a fragile perennials that, if not taken care of, will die in the winter. Some gardeners assume geraniums aren't perennials because they die if left exposed to winter conditions, or consider it too much of a hassle to keep them alive. To care for geraniums in the winter, bring them indoors and save the plants for the following year.
Cut back 3 inches of new growth from the geranium, slicing at a nub where a leaf is growing or a branch is forked. Trim in late fall or winter to help the plant become more lush by spring. Put the cuttings in damp potting soil to root new geraniums.
Spray plants with an insecticide. Bring the pots indoors before frost and harsh winter conditions set in. If the geraniums were not in pots, dig them up and pot them to bring indoors.
Select an indoor growing location where the geraniums will receive sunlight throughout the day and 60 to 70 degree F temperatures. Water as the soil dries to maintain a damp soil. Stick your finger in the soil to see if the water is soaking down to the roots or running down the sides of the pot. If it is running off, put a slow-drip water container near the base of the plant so the water will make its way to the roots.