I planted this Rhodie — R. yakushimanum 'Yaku Angel' — in 2003 and it was years before it flowered. And now it appears that it flowers every other year. Or at least that's how it is behaving in my garden.
As you can see, it has set buds which means flowers next spring. It is hardy to -20 degrees F and has come through some pretty nasty winters. I don't know what this winter will bring weather-wise, but I am already looking forward to a crop of angelic flowers.