Answer: Leyland cypress is a popular tree for screening and privacy plantings. You might also consider "Witchita Blue" or "Skyrocket" junipers. These are reasonably fast growing, upright plants. Or, American arborvitae (Thuja occidentalis) is a tall, columnar evergreen that's a natural for planting in rows for quick screening. Thuja "pyramidalis" remains only 2-3' wide at maturity. Any of these recommendations will provide tall, upright screening without blocking sun from your roses.
Best wishes with your landscape!
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