Kathy, thanks for the comment about cutting the stalk. I've gone back and forth about whether to cut the stalk or leave it. Because it is green, it is photosynthesizing and therefore providing food to the developing rhizomes. For an iris that wasn't particularly vigorous, I felt this could help.
But, I also recently read that iris borers can infest the stalk and eventually work their way to the rhizome, so this year I'm considering cutting all stalks back to the base.
