This is what cold damage (and a bit of wind to add to this plant’s misery) looks like in petunias. Peter Petunia took one for the team to share this misery with you.

Those white spots aren’t a disease, they’re physiology issues where the leaf has been killed.
Will Peter Petunia Survive An April Planting
Well, only time will tell but it’s not only a question of survival
It’s A Question
It’s a question of being stunted. If Peter survives, we’ll compare his growth with that of petunias planted when the air and soil are much warmer. Hint: Peter is going to lose this contest.
Want updates when I post something new? Click here
Moral of Story?
Plant at the proper time for your gardening zone and always – always – look down the road at the 10-day weather forecast to ensure there’s no freezing in your future.
Want to avoid this kind of problem?
Check out the other garden solutions on my Amazon ebook list here.