Answer: If you look closely at the base of your nandina, you'll see that there are old stems and new stems growing in a clump. To keep them looking natural, cut some of the oldest stems down at ground level; shorten some of the newest stems by about one-third. Thinning in this manner will provide a more natural appearance than if you took hedge trimmers to the plants and squared them off (or topped them). Best wishes with your landscape!
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