I recently acquired some land and with the goal of becoming completely self sufficient in the future I plan to start by building a green house that will produce food most of the year; ideally year round. I am near the North Dakota and Minnesota border at 47° latitude and am on a budget of about $2,000. Winters are frigid and I plan to get this built before the snow falls. Right now I am leaning towards a walipini (pit greenhouse) with a rocket mass heater.
I am a novice and would greatly appreciate any thoughts, tips, ideas... really any useful input.