By Ingramd
United Kingdom 
Why have the leaves of my rhododendrons turned black?
17 Apr, 2010
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I've found a lot of info on rhodyman.net under Hennings Rhododendron and Azalea pages. Read some of that. There's too much info to retype! go to 'Problems' section and then click on what the best description of the symptoms is. Good luck.
20 Apr, 2010