I made a HUGE mistake and added too much fertilizer to my potted roses. (I thought it was slow release, but it was "fast acting" and caused immediate burn on some of my roses.

I think I outright killed a cutting that was taken from a friends garden in San Francisco and I'm totally depressed about it because it was really starting to take off and was the only that survived (I took like 30 cuttings of all her different roses).

I may have killed one of my mini floras too (Ashton) and definitely did in one of my minis that was struggling to begin with. That one is completely toast!

My red drift and angle wings are both showing burn but not the entire plant. Charlotte shows one little branch with burned leaves. All the other roses look fine so far, but I'm worried they may worsen over time.

Here's what I've done to try to correct the problem: I removed as much of the fertilizer as I could (it had turned to mush after I watered it in. That's when I realized it was not slow release (ugh!)

I've been watering like mad. Twice a day. The cutting that I'm most concerned about looks bad so I repotted her adding more soil to dilute the fertilizer, but she still looks bad. Will it live?

Should I move the afflicted roses to a more shady area (will that help with the burning) should I cut off the affected areas?

Pics:

My cutting. What worries me most is that she seems to have turned black at the base.

Ashton mini flora. She looks like she may live, but who knows. The core stem still looks green so I'm hopeful.

My poor drift rose

Charlotte has slight damage

Luckily the rest of them are looking ok. They are all bigger plants/pots so they have not shown any damage (so far).