Answer: Right next to Tallhedge (which isn't evergreen) in the Gurney's catalog is juniper, and Gurney's claims it's "Best as a hedge at 5 feet...Comes in thick and requires little shearing to stay dense." I also recommend looking locally at nurseries, since locally-grown stock is most likely to be hardy in your area. Yew is another option - it grows like crazy and is easily sheared to shape. Again, check with local suppliers first. As for privet (L. amurense), it is evergreen in the warmer reaches of its range, but not in the north. I hope this helps!
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