That's the thing with Dutch Iris. It seems to be such a hit or miss thing. I know some people do really well with them while other people go bust. If I am happy with the blooms, and I think I will be, then I will buy more this fall, plant them elsewhere (as in not were I have theses) and just wait and see if the first go round comes up or not. It wouldn't be the first thing around here that decreases. Tulips are fabulous for me the spring after planting and then slowely decrease following springs but I do love tulips so much.