Answer: Wax myrtles are very forgiving in terms of pruning and shaping but they do tend to send up shoots from the roots if the roots are damaged. If you were to sever the above ground roots you might be encouraging sucker or shoot growth so consider it carefully. New shoots or suckers might become a nightmare in the future. Instead of disturbing the roots you might want to plant a creeping groundcover in the area to both cover the exposed roots and to avoid having suckering growth beneath your wax myrtle.
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