This is Collinsia heterophylla, also known as Chinese Houses. This beautiful plant grows about 2 feet high and blooms in the middle of the summer. It likes to live in the full sun and the butterflies like it to be in the full sun as well so that they can warm up while they are gathering nectar or laying their eggs. This is the larval host plant for the Checkerspot butterflies. This is used as an annual plant, but it is a tender perennial in USDA Hardiness Zone 11.