Prunella vulgaris - Common Self Heal
Prunella vulgaris is one of the most free flowering perennials you will find. Common Self Heal blooms with pink flowers from April through November if the plant is consistantly deadheaded. Prunella vulgaris is distinguished from Prunella laciniata by having entire leaves. There is also a white flowered form. The variety lanceolata has pointed leaves and is often found in the wild. Prunella vulgaris will survive some drought but really prefers regular irrigation or even boglike conditions. I have grown Prunella vulgaris in light shade to full sun and had it bloom and grow very well in all conditions.
Other plants from the Genus Prunella featured on this site:
Prunella laciniata
Prunella vulgaris lanceolata