I've had a large azalea (rhododendron?) in my back yard since I moved in twelve years ago. It's 5+ feet tall. Since I've been here it has bloomed maybe three times. It usually shows winter burn, then leafs out nicely - but usually with no blooms. This year it's looking really sad - new growth is slow, and needless to say, it shows no signs of flowers. I rarely if ever prune it, but I do fertilize - probably not enough! It's in mostly shade, and we've had lots of moderate drought over the years. Can anyone help? It's spectacular when it does bloom!!