Sounds like what happened to mine!!I live in Portsmouth VA.next to Norfolk VA.I hope mine did this because of the wet soil and not mildew!See my post on drowning impatiens...

Thanks so much, Violetvamp. It's nice to know my experience is not unique! Where do I find your post on drowning impatiens. I am new to this site.
Thanks.

Hispoesis,My post titled "Drowning Impatiens" is on the Forum a few posts above yours.I went out to look and I did find some downy mildew on some potted impatiens (which are also now dying)!!There is a good article on the post on this forum titled "Sick Impatiences"(spelling is wrong).Scroll down and read the comments and you will see one with a link called "Downy mildew".Click on that and it takes you to an informative article on the impatiens problem!!By the way what does "hispoesis" mean?

I haven't seen a healthy looking impatiens (walleriana) plant in my area for a couple months. Downy mildew appears to be pretty widespread.

That's awful about the disease epidemic of downy mildew.

I've read where incorporating vermicompost into the potting medium helps boost immunity to several plant diseases. I wonder if it would be effective against this disease?