Answer: Impatiens can wilt under heat and water stress, so I suspect that's what's happening to yours. Before planting them again you might try amending the soil with organic matter to help it retain moisture. As the plants grow, pinch out the tips of the stems to keep them bushy and dense. This will help them look neat and attractive and help you avoid the bare stems at the bottoms of the plants.
Best wishes with your impatiens!
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