Yes, I know this. This condition has occurred in plants in my garden. It's called "rose flower proliferation". It is commonly seen in roses but can occur in other plants such a Monarda, poppies and daisy's for instance. You are showing a good example. The cause is not known to my knowledge; however, it frequently occurs in spring and can follow late frosts or some other physical damage to the bud. In my garden it appears now and then, but if it occurs on a regular basis year after year, then it is more than likely due to a virus. Good foto.
