Ceratostigma plumbaginoides is a Leadwort or Plumbago native to the foothills of China with cobalt blue flowers from late summer till frost. Flowers resemble those of woodland phlox. This plant spreads by underground rhizomes and slowly expands to form an effective groundcover. The green foliage turns a reddish purple in the fall. The new foliage appears late in the spring. Per NC State Extension "It produces chemicals that inhibit the growth of weeds and other unwanted plants, which makes it an excellent choice as a ground cover. " Ceratostigma is attractive to pollinators, especially the hawk moth.