Midwestern BioAg gets a dream opportunity with new partnership with General Mills

“Biological farmers want to feed the soil life and create the ideal home (for plants) and we’ve got a whole concept,” Zimmer said. A major food manufacturer, General Mills, agrees. Last month, it announced it was partnering with Midwestern BioAg — the Madison-based biological farming company Zimmer founded in 1979 — to convert the 34,000-acre Gunsmoke Farm near Pierre, South Dakota, into an organic farm. When it’s completed in 2020, it will become the largest organic transition in North America, Zimmer said.