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.
However, you should not cut down or tie up the irises' leaves at this point, even if they are a bit unsightly. After an iris blooms (same goes for tulips, daffodils and other bulbs or corms), it needs to store up energy for the following year's flowers.