Answer: This shrub can be pruned in the winter, spring or early summer. If you need to cut it back quite a lot, do it as early in the year as possible. Burning bush, even in the so-called dwarf or compact form, can eventually reach 8 feet or more over time. If it is truly too large for the location where it is planted you may want to consider replacing it with something that matures to a more appropriate size.
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