Answer: You should be able to pinch the plants back (or cut the stems with scissors) to remove the wilty stems. Each time you pinch or cut a stem back it will produce two new stems. If you don't prune the plants back they will continue to develop longer and longer stems and more and more flowers but the center of the plant will always look down-trodden as it does now. Take your plant back outdoors where it can enjoy the sunshine while you decide whether you want to prune it back hard to remove the wilty stems, or allow it to continue to grow. Good luck with your petunias.
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