health White dry spots on leaves

I'm thinking sunburn, but I want a more informed opinion.  I only have this sort of damage on a few plants...all Chinense
 
 
 

 

 
 
I've had that issue when I've made 2 mistakes:
 
1) Watering in such a way as to allow the leaves to become soaked
 
and
 
2) Doing so at non-dusk hours.
 
Correcting either 1 or 2 usually resolves the issue (for preventing future burn, at least). Your issue could be unrelated, but my experience says to try watering at sunset and/or prevent as much water as possible from soaking the leaves, and aim strictly for the base of the plant.
 
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