You can only prune very lightly in early spring. Other than that I do not recommend pruning this. Pruning lightly on an older plant will likely help regenerate it though. Do not take more than a third of the plant at a time. Here is an article that will help: https://www.gardeningknowhow.com/ornamental/groundcover/false-heather/growing-mexican-heather-plants.htm
Answered on February 5, 2019
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