A long time ago, potatoes were called ghost apples in France, and farmers were reluctant to introduce them  An agronomist came up with a way to plant potatoes on a piece of land and was guarded by an armed King's guard in military dress  At night, the guard deliberately withdrew  As a result, people came to steal potatoes and introduced them into their own fields
In this way, potato planting has been rapidly promoted in France
People are curious.