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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.
Due to a thread here, I ended up at Tempo Two Iris website, and was reading some of the information. It was stated to NOT cut back Iris foliage as this would cause the Iris not to bloom. It was further stated that if the foliage wasn't looking the best, just cut the tips and pull off any dead leaves.