Teucrium ( germander) is a genus with some very different looking species.  Teucrium cossonii majoricum is a low growing groundcover with grey foliage and whorls of mauvey purple flowers that smell like honey.  T. x lucidrys (formerly T. chamaedrys) has dark green, toothed leaves with pink flowers.  It grows to about one by two feet.  T. fruticans is a shrub that can reach eight feet and has silvery leaves and lavender flowers.  ‘Azureum’ has darker, more violet flowers.  All will tolerate poor soil and need only moderate water.