Hmm. I've never overwintered Dusty Miller because they usually come back in my area. But that suggests to me that maybe they'll benefit from overwintering procedures for geraniums or fuchsias? Pot up, cut back to about 2/3. Keep outside until just before frost. Start reducing water. Just before frost, give them a thorough foliage wash to get rid of most bugs and bring inside. Good luck.
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