Is it a good idea to roll and band the iris leaves after blooming?
Just deadhead the flowers and you will be fine.
I never have and i have had iris for over 30 years now they keep coming back every year.
Once the petals of a tulip are no longer attractive, it's a good idea to break the stem off, so that the plant's efforts can concentrate on replenishing the bulb. Over time, the leaves will begin to yellow, at which time they can be cut back. If you cut back the leaves too soon, you remove the bulb's source of energy and nutrients, so the bulb's development for the next blooming season can be compromised…