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 My Endless Summer hydrangea ‘The Original’ is placed in a location where it gets a lot of sun and by 6-7pm gets shade. How much sunlight can they handle? Q ARE DAHLIAS PERENNIALS? How do I prune these rose bush shrubs? And how often? ARE PERENNIAL HIBISCUS DEER RESISTANT?