will you be able to control the spread of the hedge from
root sprouts, etc.; such as by mowing along it? If so I would consider any one of the classical evergreen shrubs now so soundly cursed as invasives in the South....many of which were originally introduced as hedges. Used as such, and regularly clipped, will reduce their invasive potential. The privets (including the larger-leaved varieties commonly called by the Latin name of the entire genus...Ligustrum), eleagnus, photinia ("red tip"), the shrubbier hollies (which have the advantage of being prickly), come first to mind but I'm sure there are others. All are easy to propagate by seeds or cuttings, vigorous, and able to grow in sun to nearly full shade. If you want to stick with
natives, the challenge will be to find something evergreen since you will want that screen year round. The hollies, red cedar, and perhaps rhododendron (especially if you are in the mountains)
should work, and both respond well to regular pruning for density.
