The parts with no roots should probably just be discarded....they have "done their thing", and the growth point has moved on ! The part with the "fan" of leaves, that has live roots, is what you want to plant. So, trim them up, and they will look a LOT more like that picture. It sounds like you will have plenty of iris, so any "fans" that are small, or damaged, I would just discard, if it was me, and save, and plant, the "nice" ones....Arlyn