Answer: Junipers can be trimmed and even sheared (some are used as topiary subjects), but will look terrible at first until new growth covers the bare interior branches. It is also possible that too severe a trimming will kill them outright. Whether or not to replace them would depend on your tolerance for the interim ugliness as well as your willingness to trim them regularly. If you opt to replace them, do try to research the mature size of the new plants, and what, if any, annual pruning they require -- it is amazing how large the tiny things we plant can become!
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