I have found a strange growth on a rhodo where a flower bud should be. It is green and comb shaped about 1 1/2" long. It looks like a roosters comb. The stem leading to it is completely flat. The leaves surrounding it are deeply veined. It's a violet coloured late Spring blooming variety. It bloomed well this Spring. It's located in a shady area surrounded by many other varieties of rhodos. I've attached pictures. I've looked up diseases and haven't seen anything likely. Anyone have an idea? Thanks, Julie
Theres a disease in plants which creates flattened stems like that called stem canker, but I'm not sure if thats what it is. Usually its controlled by cutting off the infected stems.
This is called fasciation, perhaps caused by a mycoplasma in this instance. You might try searching the string rhododendron fasciation to see if you get anything. Cultivar is called 'Daphnoides'.