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 WHAT WOULD YOU RECOMMEND FEEDING THE ENDLESS SUMMER HYDRANGEA? WOULD A 10-10-10 BE OK? My hydrangea plants appear healthy each year however, they do not produce flowers. What to do? What is a good shrub to plant now in mid-June when temps are in the 70s to 90? Morning sun, afternoon shade. I just received 4 plants. Should I wait until the fall to plant them in the ground and just keep them in their pots for now?