Answer: I can offer two observations - wait until spring to do your pruning, and try not to remove more and a third of the live growth in any one pruning session. Since pruning encourages new growth, you'll want to wait until spring to prune. Otherwise, any new growth that develops now (in late-summer) won't have time to harden off and could die back during the winter months. So, spring is the best time to prune. As for rehabilitating your plants, if they are largely overgrown you'll want to plan on pruning them over a 2-3 year period. If you remove too much at one time, the plants may not recover. Hope this information provides the guidance you need to make your junipers look terrific!
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