Question WHEN IS THE BEST TIME TO PLANT CREEPING PHLOX? Answer Creeping phlox is a tough plant! You can plant it either spring or fall. If you plant it now, you will be able to enjoy it early spring when it flowers. Tags: CareDesignFAQProjects Related Questions The leaves on my rose are getting spotty. What does it need? The endless summer hydrangeas do you take the canvas sack off around the root before planting or leave on? Can these Sweet Fragrance roses tolerate moist or wet soil? Why do my blooms look burnt?