I have had masses of impatiens all summer. Every year they just spring up, "volunteers" in all colors. Suddenly about two weeks ago, I only have bare stems with a few leaves at the top and here and there a single blossom! Huge plants are only bare stems! What is most odd is that I can see no fallen leaves! What happened to them? Could it be downy mildew (read about on this Forum). We have have had a wet, humid Spring. I live in Central Virginia.
Thanks very much!