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.
Fertilize bearded iris in early spring if a soil test shows that you need to add nutrients. As growth emerges, use a low nitrogen fertilizer watering it in well; and then fertilize again when the flower stem appears. Organic fertilizers like compost, blood meal, or fish emulsion can also be used.