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.
A decrease in bloom can indicate overcrowding and the need to divide bearded irises; this is generally done every 3-4 years. The best time to divide iris is four to six weeks after blooming, in July to early August, when the plant is semi-dormant.