Arenaria ledebouriana

This is a very distinct Arenaria with its silvery blue green softly spiny-looking foliage that is very fine indeed.  It produces fine sturdy flower stems on mass and doubles the size of the mound at this point when smothered with white flowers. Ideally grown in a sandy soil or crevice garden. Flowers in summer, when they die back simply pull off or trim sooner. 30cm when flowering , neat little mound otherwise. 30cm W  Easy and hardy. Photo by Cephas,  Wikimedia Commons