Just something I discovered in my rot search the other day: Bloomstalks that are not snapped or cut to the bottom after blooming are quite likely to rot, as mentioned in this forum. However, those that have formed bee pods (many this year) are quite firm. Do you think this might be good to do in a wet year? I imagine growing a seed pod would take energy from the plant though, and maybe not worth it in the long run?
Last year I planted iris in a new spot that had a lot of compost on it, and there is much less rot than in my main bed. It seems that frequent division is a key.