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 CAN I PLANT MY PLANTS IN JUST DIRT? HOW DO I KNOW IF MY EASY ELEGANCE ROSES DIED OVER WINTER? What is the reason my hydrangeas aren’t blooming? What do I do for fall care?