Plant with a bulb like center and with small, bluish petals surrounding the bulb. Plant was about 6" tall. Leaves are opposite on a 4 sided stem.
Kleine Braunelle (Prunella vulgaris) im Neuenheimer Feld in Heidelberg
Prunella vulgaris (known as common self-heal or heal-all) is an herbaceous plant in the genus Prunella.