Hardy hibiscus is tolerant of severe pruning however I would not do it annually. If your shrub is over-grown, you can do "rejuvenation" pruning by cutting all the branches down to 9-12 inches in late winter before leaves appear. On an annual basis, remove 1/3 of the oldest, largest branches to the ground. Every 3 years, you have a new, youthful, fuller blooming shrub. This method also controls overall height.
Answered on February 20, 2019
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