I have been given a large pot of water Iris today ( possibly Flag Iris ). There are four fairly large plants in each corner of the pot and smaller plants in the centre. It looks quite well compacted into the pot with lots of dead leaves. I'm expecting a battle to remove them . I am wondering if it might be prudent to keep them in pots once divided? I was going to put some in the pond and some in the Bog garden but don't want them running riot.