I've heard it said that Royal Celebration isn't a garden dl because it has trouble opening, but the size of the bloom (12 inches) makes it possibly a hybridizer's plant. I've had it for 4 years and have to admit a lot of times the petals were deformed, twisted and would hang up... Last year though it surprised me by opening right.
Just had to wait 4 years for it. ---And I want to use this thread to thank the hybridizers for the beautiful patterns, teeth, color combinations, and edges that have been introduced in the last few years. I don't have the patience for it, but I'm very glad you guys do!