Experts and BHG readers answer.
Hi, Well impatiens are pretty tough plants and have few diseases, but I can't help much here without more information. I've seen impatiens do this on occasion towards the end of the season if they are either over watered or underwatered. My guess is that this is something environmental and not disease, but I really can't guess without knowing where these plants are growing and how they are being treated. Give us more to go on to be able to help.