Emerald Blue Moss Phlox is smothered in stunning lavender star-shaped flowers at the ends of the stems from early to late spring. Its tiny needle-like leaves remain emerald green in color throughout the year. The fruit is not ornamentally significant. Emerald Blue Moss Phlox is a dense herbaceous evergreen perennial with a ground-hugging habit of growth. It brings an extremely fine and delicate texture to the garden composition and should be used to full effect.