I find if they are planted too deep here they will not bloom as well as they should. I've had some (in pots) that ended up pulling themselves deeper and they didn't grow very well until I dug out some of the soil. I've had some in ground that have done this and I lift those. But like Fred said, we don't have the extreme heat as you do.
I have actually read somewhere, can't remember where, that it's best here in Florida to plant the crowns less than an inch deep. I don't know how true that is but I assume it worked better for the person who said it.
