When to cut back Irises? also wanted to know when to transplant irises.
You can cut back irises foliage 6-8 weeks after they bloom. You can cut them back later if they stay green. You do
not want to cut them back too soon or too severely because they need the green growth to feed the rhizomes and to
produce more rhizomes.
You can transplant iris after the last frost in the spring. However they will probably not produce flowers after they