Twelve growers in southern Iowa are working with native perennials, and in the process, redefining what a cornfield can be — and what an American farm could become.
The first thing you notice on Henry Buchanan’s farm is how quiet it is. Not the industrial hum of irrigation rigs or grain dryers, not the metronome of a sprayer drone working a section. Just wind through tall, ragged rows of corn, and beneath that, somehow, the slow rasp of insects in the understory.
“You can hear the soil if you know what you’re listening for,” Henry says, only half-joking. He pulls a clump from between two stalks and holds it up. It is the color of dark chocolate and smells of mushrooms. Five years ago, this same square foot of dirt was pale gray. Five years before that, it had been called “played out” by the man who farmed it before him.
Buchanan is part of a loose group of farmers calling themselves the Twelve. They share seed varieties, planting schedules, soil-test results, and, occasionally, equipment. Some have agronomy degrees. Some have grandfathers buried near the field they work. What they all have is a quiet refusal to keep doing what isn’t working.
A different kind of yield
Conventional Iowa corn is judged on bushels per acre. By that single measure, Buchanan’s farm is unremarkable. By almost any other, it is extraordinary: nitrogen runoff down 84 percent, fuel and chemical inputs down two-thirds, beetle and bird counts that look like a pre-1960 ecological survey.
We used to think yield meant more. Now I think it means longer. — Henry Buchanan, farmer, Madison County, IA
The Twelve’s approach combines three older ideas the industry once dismissed: cover cropping in the shoulder seasons, strip-cropping perennials between the cash rows, and a planting cadence calibrated not to the calendar but to soil temperature. None of it is new. What is new is the precision — the satellite-thin layer of data underneath the farming — that lets a one-person operation manage it at scale.
It is also, the Twelve will tell you, achingly slow. Soil takes years to wake up. Markets are not built for slow. Neither is the Farm Bill. “If you wait for the policy, you wait forever,” says Anika Tomlinson, who farms 280 acres an hour north of Buchanan. “You just have to start.”
Tomlinson started in 2021. She lost money for two years. In year three she broke even. Last fall she sold every kernel into a regional value chain that paid her a 22-percent premium — not because the corn was different, but because the soil it came from was.
