Answer: Prunus laurocerasus (English Laurel) is hardy in your growing region, most specifically 'Schipkaensis', 'Nana' and 'Otto Luyken'. All grow wider than your specifications, and because of this natural growth habit it will be difficult to keep them at 3 1/2' even with annual pruning. Substitutes you might consider are Abelia grandiflora (glossy abelia), Escallonia, Ilex (holly) or Privet. These are evergreen shrubs and make beautiful hedging screens. An added bonus is that they produce seasonal bloom. All grow well in your area and all are reasonably pest-free. Best wishes with your new hedge!
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