Enriching any garden's color scheme, Dianthus caryophyllus 'King of the Blacks' (Carnation) is an eye-catching, loosely-tufted, herbaceous perennial with a profusion of clove-scented, dark burgundy-red, double flowers, up to 2 in. across (5 cm), atop firm stems. Elegantly rising above a low mound of evergreen, gray-green, linear foliage, the velvety, ruffled blossoms are produced in succession from late spring to mid-summer.