Welcome to the iris forums, Bron!
I am not in the south south (Virginia here), and I do not have very much experience, unfortunately. What I can say is make sure to your best ability to keep water puddles away from soaking the rhizomes for extended periods. It's rained bunches here and I have seen rot due to puddles. I guess just my two cents. I'm certain there are others with better advice to give than I can.
I have to say, Tay Daum is gorgeous! I have just recently planted Stairway to Heaven and I am stoked to have it! Good luck with your quest, Bron! Welcome once again!
