After an iris plant has bloomed, what do you do with it? Should you trim or cut it?
Answers:
Leave it alone
You should cut the actual flower stalk to the ground but you do NOT have to trim the rest of the leaves (fans). Some people trim them for esthetic reasons and when you purchase a new rhizome (iris plant) the leaves are usually trimmed - but this is to make shipping easier and planting easier. Divide them in the early fall if they are crowding each other.
Other answers:
trim it
trim it
You can cut off the flower but leave the other greens. It produces more rhizomes and makes for more blooms next year.
Pull off the dead flowers. When it's completely finished blooming for the season, i leave mine alone, but i'm not sure if that's right or not - it comes back every year.