I have some friends in the Phoenix area and I sent them some irises a few years ago. Everyone there said it was a waste of their time to try to grow them there. The soil was so bad there that they dug huge holes and filled them with top soil. I recommended that they cover the rhizomes with mulch to protect them from the intense heat, and plant them where they would only get morning sun. They have had some success with them, at least until last summer when they had record high temps. They lost a few. I think she waters them every other day. I am going to send them some more this fall, around September when the temps are cooler.
