Be extremely cautious when using fertilizers with high levels of nitrate nitrogen. Azaleas cannot metabolize this form of nitrogen and plant death can result in some situations. Some folks are repulsed at the thought of pruning azaleas. However, many azalea varieties benefit from pruning. Pruning is especially desirable to produce more handsome and compact growth for tall-growing varieties.
Dwarf azaleas benefit from pruning by improving flower clusters and shape.
Plan to do heavy pruning immediately following flowering. Remove ALL dead or injured branches to reduce future disease and insect problems. Tall, rangy limbs that appear in the top of the plant should be removed down inside the body of the plant. Pruning after July or early August will remove next spring's flower bud. After pruning, mulch the bed.