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 Will it hurt my plants if dogs pee on them? I would like to put the hydrangea I just bought in a large pot instead of in the ground, is that possible? ARE PERENNIAL HIBISCUS DEER RESISTANT? Q HOW DO I KNOW WHAT ZONE I AM IN?