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.
Most rhizomatous iris should be divided every three to five years. If your iris patch is producing very few flowers, it's time to divide and conquer. When transplanting iris, first cut back the leaves to about one third of their height. Lift the entire clump with a spade or digging fork. Use a sharp knife to separate the rhizomes. Dip the knife in ten percent bleach after each cut. The new transplants should have a firm rhizome with roots and a fan of leaves.