An old-fashioned biennial, Money Plant (Lunaria annua) is also known as Honesty and Silver Dollar Plant. Native to central and southern Europe, it was brought to the United States by the Pilgrims. The attractive purple (or white) flowers appear in early spring, from 1 - 3' feet tall. After flowering, the seedpods develop. They start out green and turn to silvery white or translucent orbs that resemble coins. The seeds inside can be dried or simply removed and scattered (nature will also do this for you as it is a notorious re-seeder.) They also are popular in dried flower arrangements. A member of the Mustard family, it is said that the white tapered roots can be eaten raw or boiled.
Easy to grow, just sprinkle seeds in the fall or early spring. It flowers the second year from seed and will probably re-seed for you. You can always scatter more seeds to assure successive flowers.