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.
Iris grows from a thick root called a rhizome, which continues to grow and expand each year. Irises generally require dividing every three to five years for best growth. Cut the foliage back to one-third its height before digging up the roots six weeks after the last flowering cycle.