I didn't answer because I'm not experienced with rot. Had it once with one iris.

Some people would say not to replant in the same area. I say look at the soil conditions in that area. Is the soil allowed to dry between soaks? Especially in warm temps. Are the tops of the rhizomes kept exposed to air and light? Are they getting too well fertilized with a high nitrogen fertilizer? (10-10-10 is too high --- first number needs to be lower)

When you said they are looking very healthy right now, I became suspicious. Mine look rather tired now. Maybe yours are rebloomers and their appearance is different at this time of year?

The 10:1 water:bleach dip won't hurt but not necessary if you've cut away all rot and allowed them to cure a couple of days. Only give one thorough soaking after planting and wait 1 month before the next soak. This is the rule my grower friend uses in her decomposed granite "soil" and I found it works in my improved adobe soil. Her average summer temps are 90-100 & mine are 80-90.

Iris Gal, thanks. I threw away the mushy ones, left three healthy ones but pulled the mulch off them. Three healthy ones that I dug up I will replant in another spot.

These are occasional rebloomers, but not reliable. I don't know the name but they are a deep, rich purple and the most robust irises I have ever grown, though admittedly I am not a very experienced iris person. I know what you mean about the faded foliage. My Batik irises look like that, as do my other (but different) unidentified purple irises.

Rosefolly