Now, going to need a little more information about what you mean by "tree farm".
Help us out here.
I have a walnut plantation with trees on 10 x 10 spacing. I've several acres where trees are recently planted spruce, ash, and oak in meandering rows. I have most of the "tree farm" in mature oak, ash, walnut, basswood, maple that I use a rotary mower in places.
What do you have that you call a "tree farm" ?