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I have thinning arborvitae about 20 feet tall? What cam I do to increase growth and thickness?

Feed them with Espoma Tree-Tone food.  Pound holes or dig holes in the ground around the base of the plant of throughout the hedge and pour the food into the holes.  Do this every spring as soon as the ground thaws.  Also trimming the top will force side growth lower on the plants.

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