Morning Glories: Help-plant disease or damage, 1 by Badgertalk

Badgertalk wrote:
I lost some of my MGs to a late frost and now these are looking bad. These are some "rare blue mix" Japanese MGs I bought on EBay. The leaves look variegated but they aren't --its is the tan/brown damaged area along the leaf rib. These had not sprouted at the time of the frost and it seems that the edges of the leaves would be damaged, not the centers. The picture seems to be focused on the dirt rather than the leaf; still learning how to use this camera.

What is wrong here?

I'm looking to participating in this group; I recognize several names from EBay.

Also--is there a way to change your zone? My zone says 7a but it really should be 6a (7a with a mild winter).

Thanks,
Phyllis