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Mark,I got a row of blue spruce and eastern white pine 15' tall growing along south side of a drive to screen out traffic. The row runs east and west and house is to south of it. The row is 100' long but as it gets to about 50' west of a large walnut tree pines won't grow there. What I would like to know is there something that would fill in that 50' gap. Would spring grove arborvitae or something like this grow in that walnut zone. I would like a evergreen 20' tall at maturity.