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Random branch evergreens like junipers, arborvitae, yews, and hemlocks usually sprout new branches with flat needles during the spring. You can prune them for size once or twice annually, but you should leave behind at least one-third of new growth during each pruning.  The needles on areas of new growth tend to be softer and lighter in color. Leaving some new growth behind is beneficial for the health of the evergreen. As the name indicates, random branch evergreens grow in less naturally-structured shapes than do pines, spruces, or firs. This means you may want to be a bit more aggressive in shaping them to suit your aesthetic preferences.  You can shear random branch evergreens several (e.g., 2-3) times during the spring and summer, if you wish. However, as you shear and prune for shape, make sure to leave behind some of the new growth. Random branch evergreens don’t need to be shaped, and will do just fine if you let them grow naturally. Most random branch evergreens develop an area in the center where there are no needles, due to the lack of sunlight. If you prune back to this “dead zone,” new growth will not occur there and you’ll end up with a bare patch. When pruning for size or shape, work with what you have instead of trying to force your evergreen into a specific look. For instance, try to find the beauty in the “randomness” of your upright juniper!
Remove up to two-thirds of new growth to control their size. Prune or shear them for shape in spring and summer. Don’t prune them back to the “dead zone” in the middle.