I cannot seem to grow Rhododendron. I set the Rhodo’s in Brown Gold. Dug a deep hole and filled it with brown Gold. However even a large Rhode is now starting to turn black – this will spread and kill the entire plant. A smaller Rhode is already ravished and died as per pictures. Thanks Gerry. If you have any solutions. I live on the side of south facing hill. Open to elements. I thought Rhodo’s were hardy.