Answer: The answer to your question is basically "It depends". First off, there may be some die back or winter kill after the winter season and that should be removed. In some years this could mean cutting it nearly to the ground. In other milder years this might be just a few branch tips. Next, you can prune for shapeliness and to encourage bushiness or branching; you can also prune to try to limit its overall size. The plant has a naturally gangly shape and can grow very large in one season, so some gardeners will opt to prune more than others. Finally, each cut will force the plant to branch and each branch tip will bloom, so you can also influence the number of blooms. If there are fewer blooms then they will be larger, but with more blooms they will individually be smaller.
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