Rose essential oil is a typical representative of essential oil. Rose essential oil is the most expensive essential oil in the world and is called "after essential oil". Taobao, the first to promote Dixiang rose essential oil, came from "Rose Valley" in Kazanlek, Bulgaria. Its superior geographical location and climatic environment, as shown in the figure, are the best places to produce every kind of rose essential oil. Take out the yellow-brown rose essential oil within 24 hours after picking roses in the morning. Five tons of flowers can only extract two Jin of rose oil, so it is one of the most expensive essential oils in the world.