When you rub some flowers of this plant between your hand, you get a kind of foam and you can wash your hands with it. At least, Soapwort (Saponaria officinalis) can give you the impression you really got clean hands.
It is a plant that lives in large communities with lots of stalks wit bunches of pink flowers. You find them often on roadsides and edges of cultivated fields. It needs a not too poor soil and planty of place for the whole clan.
Already when it flowers, fruits develop.
But it happens that, after summer and after having been cut, Soapwort flowers again.