2 years ago I transplanted a Rhodo from my Mom-in-law's into my garden. It's been very, very leafy, but last year only about 5 flowers, and this year only 1 lonely flower! What to do? I trimmed it down a bit last year, dead-headed and took all the dead leaves off when they were done... maybe I should just leave it alone??
It was probably the pruning. The flower buds are set on the ends of the previous year's strongest shoots each fall.