Non flowering rhododendron
United Kingdom 
I have a rhododendron, which is in a tub, when I brought it, it was in flower, last year it budded but they went brown and fell off. This year it has budded but they have not opened. What is wrong??
6 Aug, 2008
Answers
Rhodos need a moist acid soil. Failure to set or open flower buds can be an indication of insufficient moisture (having said that, they do not want to be sitting in water either).
6 Aug, 2008
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Hello Joanpearson18
Rhododendrons Need Acid Soil to survive if it is restricted from sending down tap roots because it is in a pot then your success rate is minimized......
May i suggest finding a place for it in your garden where it can stay for a couple of years to establish itself.
Hope this helps
Best Wishes
Kev
6 Aug, 2008