This is a gardening question : is it OK to cut back the iris now?

If the foilage is totally brown yes,if there is still green on the leaves no,as the bulbs feed from the foliage

Once the leaves have turned brown you can cut them back, or dig up and separate, planting extras in other areas.

When you take them out to replant, cut the leaves down into about a 4 to 5 inch fan shape. After blooming is done, you can cutback the flower stalks, but don't cutback the leaves until you are ready to separate and transplant irises in the fall. From answers.com

Yes. I have been lucky with iris, cutting back when Fall arrives, separate the bulbs and replant. My plants are "generational plants" dating back to both my Grandmothers. I move, the plants of all kinds move with me. Sharing with family, keeps us close.

I cut the leaves of my Iris as soon as they start to fold over and hit the ground. I do it to keep them looking tidy but also, leaving them to start drying out robs the plant of moisture.