Q: Most all of my potted impatiens got very spindly, stopped leafing and blooming leaving just bare stocks. Was it from over watering or our very hot Minnesota summer?
Your impatiens may have impatiens downy mildew. Remove the plants roots and all and place them a plastic bag and put them in the garbage, If it is downy mildew you should not grow impatiens in that soil for the next 5 years. Best Nancy
Q: That's exactly what it is. I can't remember if I bought all the pots from the same nursery. It sounds as if the mildew can easily spread to surrounding impatiens pots. Thank you for your prompt answer.