My grandfather in the US Midwest in the 1950s farmed specifically to harvest seeds for planting which he then sold to his regional neighbors via distributors. I

My grandfather in the US Midwest in the 1950s farmed specifically to harvest seeds for planting which he then sold to his regional neighbors via distributors. I don't know the specifics, but I understand that even back then the farming practices were sufficiently different that the specialization was warranted.