Bringing in plants for the winter
Most people who keep geraniums over winter stick to a method that has worked well for them. However, there are several ways to do it. You may want to try more than one and compare the results. Go here to learn about this:
Inspect plants before taking them indoors. Dispose of any that appear to be significantly affected by disease or insects. If infestations are present, but minor, follow the recommendations found in the following bulletins. When in doubt, keep suspect plants well away from other indoor plants until any issues are resolved.