Three Dead Needle Perennials.  Live plants from Bruce Nurseries.

Dead Nettle is a robust, carefree groundcover that grows readily in shady areas. Plants are topped with lovely blooms from early to midsummer, and many have silvery leaves that bring light to shade beds. Tolerant of dry conditions, Dead Nettle is perfect for planting beneath trees or in a border that receives less than half a day of sun.