Certain varieties of salvias are hardier than are others, depending largely on where the variety originated. Salvias originating from high mountainous areas are generally hardier than are those from lower elevations. Salvia nemorosa ‘Amethyst’ , Salvia nemorosa ‘Caradonna’, Salvia nemorosa ‘Ostfriesland’ and Salvia verticillata ‘Purple Rain' are among the hardiest.