Turn your burning bush into a tree by examining the plant's trunks and selecting a strong leader branch positioned in the center. Cut all others at the base. Alternatively, retain more than one trunk, but remove all lower branches sprouting from them so you have a crown atop the trunks.
Prune the entire bush back to 6 inches from the ground to rejuvenate it in shrub form. This takes the plant back to a point where it will be several years before it reaches its mature size again.
Cut diseased and broken stems in late winter to early spring. Make your maintenance pruning cuts at a 45-degree angle ¼ inch above a bud.