PBS television had a show about irises. The radio gardener guy said to transplant irises in the fall. The pbs show said to transplant them in July or August. I wanted to transplant in August, but I waited because the guy on the radio was so insistent about transplanting them in the fall.
The pbs show said not to mulch the bearded irises. Well, mine are mulched. I guess I'll go pull the mulch away. That will be a big job. It said to not fertilize them. I've been fertilizing pretty regularly. The greenery is wonderful on mine, but I didn't get much in the way of blooms.
About the only thing it looks like I did right was to keep the dead stalks and leaves picked off.