In my climate, I leave perennial foliage over the winter to hold leaves and snow as extra insulation; but you'll probably cut yours down after the first frosts. However, this eccentric plant can require some specific pruning. If that's not enough, next year you can do it by 1/2 or even a little more, but for this year try 1/3. Healthy phlox plants can be cut back by half after the flowers fade from late summer to fall to prevent reseeding. If you want to keep this plant healthy during the long winter months, so that it comes back vibrantly in the spring and summer, it's important to provide winter care for the plant. (See local frost dates.) Trim back the entire plants by one-third to one-half their height. It’s also easier to remember where late-rising perennials are located in the spring when the stems are standing and thus avoid accidentally digging in that spot. These flowers tend to attract butterflies and other pollinators to a garden. Splitting phlox plants can be done in spring or fall, but should never be done on hot, sunny days. Phlox is prone to the disease powdery mildew, which disfigures the plants from the bottom up, covering them in a whitish powder. Shorter phlox varieties such as creeping phlox (Phlox stolonifera), hardy in USDA zones 4 through 8, and moss phlox (Phlox subulata), hardy in USDA zones 2 through 8, need to be cut back after they finish flowering. A phlox plant can be a beautiful addition to any garden. Remember to remove the dead/faded flowers so that your plants can rebloom. An overgrown potentilla can be cut back in early spring to rejuvenate. Pinch it back by about 1/3. It blooms in the late spring to early summer with clusters of fragrant, five-petal flowers that stretch almost an inch across. Garden phlox will die back to the ground in winter and reappear in spring. Creeping phlox (Phlox stolonifera) is a low-growing, mat-forming plant that is often seen spreading as a ground cover, in rock gardens, and even in crevices of stone walls. Perennials to cut. Cut the foliage back to approximately 1/3 before dividing the phlox, unless you are transplanting them in the spring when new growth is small. I would let them be right now. Your plants will be bushier, and will have more flowerheads, but the heads will be smaller. Seedlings from named cultivars revert to the magenta pink of the plain species plant. Plants that do not provide many benefits to wildlife or winter interest can be cut back in the fall to reduce labor in the spring. When dividing phlox in spring, it should be done just as the new shoots appear. When we hear discussions of cutting back in fall, it's usually about whether the tops of perennial plants should be pruned off. Divide tall garden phlox every 2 to 3 years to ensure healthy and disease-free plants. 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