The fresh longan is a fruit, and the dried longan is a tonic. That is to say, longan is dried into longan.

Since the fruit could not be stored in the past and was not conducive to transportation, longan was always dried before being shipped to the north. Because longan is produced in Guangxi (Guangxi) in large quantities and is round, northerners call it longan. , (I wonder if it was because it was taboo to talk about dragons in the feudal era, so it couldn't be called longan, so the official name (in the north) was also called longan), so they didn't know that the original form of longan was longan.

Later, the fruit could be stored and transported easily. Longan was transported to the north as a fruit. However, the northerners had never been exposed to it, only its mummy "longan", so longan was also called longan.

So in the south, more people call longan longan, while in the Central Plains and the north, more people call longan longan.