phlox subulata (moss or arctic phlox)

This is a low-growing ground cover for full sun and well-drained soil - perfect in my rock garden.  It also comes in white or mauve flowers.

This type of phlox has evergreen needly leaves that benefit from being covered by some spruce branches in the winter, or else the plant experiences quite a bit of die back.  But cut off the dead stuff in spring and it bounces back anyway.