Diodorus Siculus reports an allegorical interpretation of the myth of the dismemberment of Dionysus as representing the production of wine. Diodorus knew of a tradition whereby this Orphic Dionysus was the son of Zeus and Demeter, rather than Zeus and Persephone. This parentage was explained allegorically by identifying Dionysus with the grape vine, Demeter with the earth, and Zeus with the rain, saying that "the vine gets its growth both from the earth and from rains and so bears as its fruit the wine which is pressed out from the clusters of grapes". According to Diodorus, Dionysus' dismemberment by the Titans represented the harvesting of the grapes, and the subsequent "boiling" of his dismembered parts "has been worked into a myth by reason of the fact that most men boil the wine and then mix it, thereby improving its natural aroma and quality."