The secret to dense carpet of creeping phlox in your gardenCreeping phlox (Phlox subulata) is a groundcover perennial that creates a dense, evergreen "carpet" 4–8 inches (10–20 cm) high. Photo: Pravda.Ru by Olga Sakiulova, https://creativecommons.org/public-domain/pdm/ PhloxesSite Selection and Planting ConditionsTo achieve the most abundant flowering, creeping phlox must be placed in the sunniest areas of the garden. Igor Lytkin, soil scientist: "For creeping phlox, drainage is critical. Maintaining and Rejuvenating Creeping Phlox A sequence for preserving the compact form and vigor of phlox cushions. Post-Bloom Pruning Lightly trim the cushion after the main spring flowering wave to stimulate the growth of young shoots and maintain a compact shape.