Also known as Bouncing Bet, which Wikipedia tells us is a traditional epithet for a washerwoman: the sap produces suds that can be used to wash clothes. The usual form is single, but once in a great while a double form shows up. The double forms became prized cultivars, and some of their escaped progeny may in turn contribute to the double forms we see in the wild. These plants were blooming in front of the abandoned St. Wenceslaus Church in Scweitzerloch.
For a description of the species, see the Saponaria officinalis reference page.
