Answer: Unfortunately, that cherry tree will likely cause the plantings along the wall to grow unevenly so you may want to try a variety of plants. Some needled evergreens to consider would certainly be the taller and more narrow forms of juniper or possibly the more columnar forms of arborvitae. These are probably the fastest growers. If you are willing to mix and match the planting in drifts, you might also consider the leatherleafed viburnum for a portion of the planting and the vining English ivy to grow on and soften the look of the wall somewhat. If you want the fastest growing plant possible, you might consider privet and allow it to reach its full potential height of about 15 feet. It is after all a classic hedge plant, and for good reason: it keeps its foliage late in the fall, leafs out early in the spring, and is very amenable to clipping and shaping. I hope this gives you a few ideas.
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