Looking for a narrow rhodo
I'm considering a white or light pink flowered rhododendron for a somewhat narrow bed. I'd like the plant to not exceed 3' at maturity, although it can get up to 5' tall. I've been pouring through lists of rhodos, but most give 10 year sizes only and then only heights and I'm not sure if these are actually mature sizes (or at least 20 year sizes). I like some of the yakus and yaku hybrids, but have seen conflicting 10 year sizes (some say 3' some say 4' wide and 4' is too big for a 3' wide bed).
I'd also consider any rhodos with very light blue or purple flowers. Any suggestions? Also, how well do rhodos do with pruning if, for example, I tried to keep a plant naturally growing to 4' wide down to 3'?