Answer: Fall and winter are usually good times to transplant perennials because the plants are not actively putting on new growth and won't go into shock as easily in the cooler weather. Nandina grows straight up from stems (almost like bamboo), and branchesout at intervals with fine textured foliage. If you cut back the branches, you'll get denser growth but it will never be a short, fat shrub. Best time to prune is early spring, just before the new growth comes on. One of the things I like best about Nandina is the red color the leaves turn in the winter time.
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