It is thought that there was a person called Ryouemon HIRANO, an iron worker from Nagasaki who was involved in the sweet potato cultivation with Konyo, and it was HIRANO who did the actual cultivation.
長崎の鉄工・平野良右衛門という昆陽とともに薩摩芋栽培に携わった人物がおり、実際の栽培は平野がおこなったと考えられる。