Although I do deadhead mine, I don't think it'll really matter considering you can't actually reach them! I bought a reduced one at the garden centre last year, it had flowered and wasn't looking great. It was spectacular this year so that's proof enough for me :o)

Thank you Busybee26

We've got over 40 rhododendrons and whilst some get dead headed most don't I know it looks unsightly but by allowing the flowers to fall to the soil they help to add humus.

Thank you moongrower. Mine are getting a bit out of hand so I will cut them back soon.