Answer: Summer blooming shrubs bloom on new wood so are best trimmed at the end of winter dormancy, just before new growth starts in the spring. Pruning now will eliminate bloom potential. Also, it's generally not advised to prune after transplanting. Transplanting itself is a shock, and pruning another one. Pruning eliminates the foliage that is needed for photosynthesis so the plant can grow a vigorous root system. Finally, don't prune in fall. Pruning stimulates tender new growth which is prone to frost damage.
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