Roses have long been known as the "flower of love," because mythology proclaims it to be the favorite of Venus, Roman goddess of love. The red rose symbolizes love and passion and the gift of a dozen red roses to your Valentine is customary on this day. Yellow roses signify friendship and white represents purity and faith.The pink rose means happiness, which presents an ironic twist for this holiday because a pink almond tree blossomed over Saint Valentine's grave.