Here’s an picture

Flowers do not last forever, maybe 4-5 days at the most. If you sprayed while the full sun was hitting them, that can damage them too. Wait another week and you’ll have flowers again.

I see some new blooms pushing out. I would deadhead the ones I didn't enjoy and pop off the leaf that has some brown. See what happens after that.

Thanks for replies..... but even the new blooms have that white tinge to them still. The rain stopped, in the 90s all last week. Could these plants just be diseased? I bought them through a mail order company. Planted them in window box in May.

This time last year I bought the same flowers at local nursery and they were huge by now. Beautiful, see what happens when you try to save a few pennies