Relations and functions | Functions and their graphs | Algebra II | Khan Academy
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.
Actually, unlike most perennials, iris goes dormant in summer. The perfect time to dig and divide them for most parts of the country is early July to the end of August. Remove any dried up parts of the rhizome, cut the leaf fans back to about 6 inches and plant them with the top of the rhizome visible at the soil line and they'll do just fine.