Blue Moon (Phlox divaricata 'Blue Moon') is a perennial with showy purple/lavender-blue flowers. It may grow to approximately 1 foot with a spread of 1-1 1/2 ft. Enjoy flowers in the late spring to early summer. When the weather turns cooler, the leaves turn burgundy. It will tolerate full shade to part shade in moist, well-drained, rich, organic soil.