Yes. I have been in this place about 15 years, and parts of it were established before me. The wild irises (they are called Blue Flags) predated me and they expand every year. I just love them!I never expected it to flower. Many years ago, I was told irises need a lot of water and sun: that one has had very little to drink and it's in shade most of the time. The friend who works on the garden for me brought if from another garden she works on.
Have you been keeping your garden for many years RC?