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 mix lime in the dirt when I plant my hydrangeas to keep them pink and red? I have an 18″ x 18″ pot and would like to plant either a 1 or 2 gallon hydrangea bloom. I live in NYC and have a large terrace. Am I better off to get the 1 gallon size and keep it trimmed to fit in the pot as it grows – and replant it to a larger pot – or divide to fit in two pots later on? What do you mean by mulching in the winter time to protect the early buds. My plant is 3 foot tall- do mean mulch the top of the dirt? IS COPPERTONE DISTYLIUM DEER RESISTANT?