Hi jm19 --
OK -- I'll be the odd man out. I think trimming the leaves is a good idea. First of all, leaves are where the moths lay their eggs that become borers. No one wants borers. Second, as Irises approach winter, their leaves will begin to dry or brown off -- and begin to look really ugly. I trim any browned/damaged leafs -- but that usually leads to trimming most of them. I do remove all totally dried leaves, or any that have become loose and are laying on the ground.
I think fall trimming and clean-up is a good idea.
