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.
Iris should be divided in the late summer after they have stored energy in their rhizomes all summer. If you wait too long into the fall to replant the rhizomes, the roots may not have enough time to establish before the ground freezes and the plants will be subject to frost heaving.