Burning bush is very forgiving of severe pruning. Try cutting it down to 12 inches before new leaves emerge. Another strategy is to remove 1/3 of the oldest, widest branches each year. This classic method avoids the jarring eye catcher of a large shrub cut down to a stump. In 3 years you have a shrub of a more compact size. Since it is such a vigorous grower, continuing to remove the largest branches annually rather than clipping the top growth to contain size yields a more attractive shrub with more leaves. It also creates openings for sunlight which is necessary to keep the center from losing its leaves. Older wood is, well, woodier; younger branches have more leaves. The choice is yours.
Answered on February 24, 2019
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