Barbara Kingsolver.. and so many titles
Animal, Vegetable, Miracle I think is one good one (i might be slightly off on the title of that), and Prodigal Summer I finished last summer and is VERY good.. quite woodsy/farmy actually..
http://www.amazon.com/s/ref=nb_ss_gw...solver&x=0&y=0
Oh, I see you want midwest.. I think the first two I recommended are more Kentucky/Tennessee area..
although Bean Trees (also by her) starts out in Kentucky, the main character travels about west as you can get.. still a small town girl kinda thing, though. Pigs in Heaven is its sequel..