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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.
The various types of iris will bloom at different times, and bloom time also depends on environmental conditions. A clump of iris generally bloom three to four weeks after planting. Some varieties will re-bloom four to eight weeks after the initial bloom as well. Iris need 15 to 20 weeks of cold to initiate blooming, according to the University of Rhode Island Landscape Horticulture Program website.