One of Martha Stewart's recommendations for a lush privacy hedge is the European hornbeam (Carpinus betulus), a deciduous tree that thrives in zones 4 through 8.

PSNH / Flickr / CC BY-ND 2.0. The smooth, gray, rippling bark of Carpinus betulus shields extremely hard, strong wood inside. Fastigiata European hornbeam, the most commonly sold hornbeam cultivar ...

One of Martha Stewart's recommendations for a lush privacy hedge is the European hornbeam (Carpinus betulus), a deciduous tree that thrives in zones 4 through 8.