Rhododendrons and horse muck !
We inherited about a dozen, mature rhododendrons/azaleas when we bought our house. They are in a shady area under trees and a very overgrown beech hedge. We have severely pruned the beech hedge now and the rhododendrons are now getting more light and seem to be doing a lot better this year. I have a huge amount of well-rotted horse manure (with and without straw) - any reason not to mulch the rhododendron with it ??