Q.Pruning banana shrub
Can I cut back a shrub that is about 8 feet tall to about 4 ft without killing it?

drtreelove
Answered on January 20, 2019
It's best to keep the height reduction and removal of foliage to 25% maximum at one time, in a year. The more extreme reduction of 50% may not kill it, but there are possible detrimental effects.
https://www.gardeningknowhow.com/ornamental/shrubs/banana-shrub/how-to-grow-banana-shrubs.htm
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