Impatiens are susceptible to a fungus which causes root rot. If your plants wilt suddenly at the soil level, this is most likely the problem. It's a bacterial disease and there's not much you can do to control it once it attacks your plants. I'd remove the affected plants, along with the roots and soil to remove the disease pathogen so it won't affect the remaining plants. So you won't have a problem with it again, plant something else in the area this year and try planting impatiens again next year. Good luck with your garden!
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