I don't know about the particular ones you have, but in your info I can't find anything on what zone or state you live in. I think iris are like many other flowers and have to have a certain number of chill hours. IF you happen to live in a climate that is borderline too warm for them, they will not perform properly. Also if the soil is too loose, (not enough clay) and you live in an area with freeze/thaws your iris can heave. Of course this is obvious though, so you probably would have figured that out by now, but maybe not if there is leaf litter over their tops. They heave out of the ground, even just a little and it can dry out the roots and prevent them from good contact with the soil. This can also give you a poor bloom season.
