Please help us continue to provide you with our trusted how-to guides and videos for free by whitelisting wikiHow on your ad blocker. Yes, you can divide phlox as soon as you want. A good time to divide your phlox is during the early spring, late summer, or early fall when the plant is as wide as it is tall. Creeping phlox grows best in shade or dappled sunlight in soil enriched with leaf mold, pH 5.5 to 7.0. Aug 18, 2015 - Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. Meta Contact Us Unlike annual blooms, perennials produce new shoots every year and continue to grow larger. /*