You can use any double plant (double block vegetation flower), you need to be at the same level has the root of the plant (if you're in top of it you don't see it)
and when you destroy it (creative) we see the texture flower_paeonia.png for a very brief instance.
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This issue is a duplicate of MC-53439. It has been linked to the original bugreport.
Please search before reporting any bugs, as it's likely that one exists already.