Perennial Herb: Rock garden, ground cover, edging & border plant with serrated foliage. Of the CA native P. vulgaris. Can be mowed & walked on. Used in herbal medicines. Attracts bees and insects. Blooms: summer. Color: deep violet-blue. Height: 4-12". Exposure: sun/part shade. Water: moderate. Tolerant of clay. USDA Z3.