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I'm sure I read that leaves should be left alone for six weeks to strengthen the iris and create more offsets. They can be cut back, lifted and moved after six weeks. So if you can pot up the annuals and wait the six weeks, then move enough irises to plant your annuals at that time. Thanks Good ideas. Think I will wait 8 weeks, then lift some Iris and move thus freeing up space for annuals.
Conflicting info on many sites. I think Schreiner says to cut the fans back. Others say not to. I definitely will cut off the brown or spotted foliage but I wait until after the first hard frost. I suppose it depends on where you live (zone) and how badly things like too much rain or snow you get affect your irises.