We purchased this rhododendron last spring and planted it in the ground. It was fabulous as can be seen in the photo. I am new to gardening but did all my research and thought I did everything right. Kept it watered during the summer, mulched with plenty of ericacious compost etc. this year the buds have appeared long and thin instead of short and fat! They have started to open but there does not seem to be any flowers inside! Again see pics. Please can anyone advise why this has happened and what I should do next?