Rhododendrons are very tough plants, generally their needs are fairly minimal. Free draining soil and plenty of water, and acid soil and you should be good to go. At RhodoDirect we have very few problems growing rhododendrons in our own garden. Our freezing winters are good for cleaning up any bug problems and our soil is good, our property is an old river bed so drainage is excellent. However there are a number of common problems that other gardeners may experience.
Holes in the leaves eaten by bugs