Answer: December or January are typically the best months to plant impatiens in your area and I would continue to plant them during these months in the future. I suspect overly wet soil contributed to the decline of your plants. They are subject to fungal rot when rainfall is abundant and drainage is poor, which is probably what happened to your plants this year. Next year may not be as wet. You can help your new plants along by amending the planting beds with organic matter to facilitate drainage. Best wishes with your second crop of impatiens!
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