I'm sorry to hear that you have been having some issues keeping your air plants alive in Wisconsin. It sounds like they aren't getting quite enough water. Air plants should be soaked at least once a week for around 30 min to an hour, and then allowed to dry for 4 hours or so before putting them back in place. Misting or spraying isn't enough water for most air plants. Also, you should only fertilize your air plants once a month. They could be drying out due to over-fertilization, which can burn the leaves.
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