United Kingdom 
WHEN iRIS HAVE STOPPED FLOWERING DO i CUT THEM BACK
19 Jun, 2010
Answers
when the iris have finished flowering I de-head them and when the leaves start to wilt I cut them done (leaving about 2-3 inches above the ground). I treat iris as I would daffodils. They always come up every year.
20 Jun, 2010
You can cut out the flower spike but don't cut the leaves back
19 Jun, 2010