Answer: Unfortunately, based on your description I am not able to tell you exactly what is affecting your geraniums. These plants are potentially subject to a variety of foliage problems that can become apparent indoors. Some of what you are seeing may be part of the adjustment to being indoors. You might remove the worst affected leaves, then make sure the plants are in a spot with good air circulation. Avoid wetting the leaves when you water the plants, and make sure you are not overwatering the plants. Also, do not overfertilize them while they are indoors and growing less vigorously due to the reduced lighting conditions. If the problem continues, you might take a sample or two or some photos and consult with your local professionally trained nursery staff to obtain a more specific diagnosis. Good luck with your geraniums.
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