What are good plants to grow in planter boxes for a privacy screen?

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I have a cedar hedge on the edge of my patio that serves as a privacy screen. The hedge is past its prime and needs replacing but the ground is root bound from a nearby maple. I thought a row of planter boxes with some kind of tall plantings would look nice. Looking for some economical suggestions as to what plants would be tall enough to provide a privacy screen and would do well in planter boxes.
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