Beginner Gardening: Why are my impatients dying, again?, 2 by LMHmedchem

LMHmedchem wrote:
Once again, my impatients are dying off for no obvious reason. Not long ago, my beds looked like the bed in the pictures with the rosebush. Now they are looking like the other one with almost have of the impatients dying off. I have included a closeup as well.

This has happened to some degree or other for the last few years. I cannot find anything on the plants or roots that looks out of the ordinary. All of the inpatients get the same amount of water and fertilizer and all the beds are prepared the same way, so I have no explanation for why some of these suddenly die off and others look just fine. This doesn't seem to happen with any other plants in the yard.

The only different between these beds is that the one that is dying off has been edged and mulched with brown earthgrow mulch. I just didn't get to it with the other one yet. I can replant some here, but I am reluctant to do that without knowing what is causing the problem.

Advice would be appreciated.

LMHmedchem