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.
Answer by thewindrose (642) Only prune back the flower stem after it has bloomed. You do not want to cut back iris leaves, or they may not bloom next year. To thin plants, dig up the rhizome instead. It will be very close to the top of the soil. Then you can transplant them or give them away!