[Eric in the Ozarks]

I used to call on a potato company in Plover, WI.
Years ago, the company acquired a small “perched” lake.
The lake was drained and provided an excellent potato growing locale.

[Diana in Wisconsin]

The entire ‘middle’ of our state was ground to a pulp due to the Glaciers. It’s excellent soil for growing potatoes, carrots and onions. And the land is flat, flat, flat...also thanks to said Glaciers. ;)