I've never had rust on Wild Cherry Round Up, or any other daylily, so rust has never been an issue for me. I haven't grown daylilies in a warmer zone though, so I never give it any thought. I'd worry though, about buying something with a rust bucket in it's ancestry if it was a problem for me. It was a bonus plant, and wasn't something I was looking to buy, but it's a nice daylily. Good to know that it is supposed to be good for getting a rounder form.
