As part of a "make work" project in the 30s, the government had this "forest" of evergreens planted in the middle of virgin prairie. It served a dual purpose: it put unemployed men (women weren't thought of as part of the work force back then) to work, and gave scientists a chance to observe how these trees would grow in an arid prairie environment. This is just a few short miles from where I grew up. We were on a lake that in most years is dry as a bone but is full of water this year. The pasture is now filled with oil wells as well as cattle. Saskatchewan.