Crocus sativus is commonly known as saffron crocus, or autumn crocus. It is a species of flowering plant of the Crocus genus in the iris family Iridaceae. It is best known for producing the spice saffron from the filaments that grow inside the flower. To plant, just dig a hole about 10 cm deep, put in the bulbs, cover with soil and water. Nature will do the rest! You can order ten, fifteen or twenty bulbs.