Thuja Green Giant is the most popular privacy screen tree in the United States, as of 2009. It grows 3 to 5 feet annually, resists insects and disease, and tolerates drought. The hardy species is very easy to grow and low-maintenance. It does not need pruning because it grows in a uniform shape. When grown in a row, the trees become 20 feet tall and 5 feet wide. When grown separately, they are 40 feet tall and 15 feet wide.
Choose a planting location that is in full to partial sunlight. Thuja Green Giant can be planted anytime of year, in just about any type of soil.
Dig a hole twice as wide as the tree's root-ball. Make it more shallow than the roots so the tree can sit slightly above ground level.
Scrape the sides of the planting hole with the shovel to loosen up the soil. This will allow the roots to penetrate the ground when they grow.
Place the tree into the hole. Make sure it sits slightly above the surrounding dirt, because it needs support from underneath to prevent it from settling.
Spread the tree's roots out in the hole so that they have room to grow. Ensure that it is sitting in a vertical position.
Loosen the displaced soil to remove large clumps, because they will cause air pockets. Shovel the dirt back into the hole.
Tamp down the soil to remove air pockets. Pack down the rest of the soil, creating a slight mound.
Water the tree once it's planted. Spread 2 to 3 inches of mulch around the base to help the soil retain moisture. Leave a ring around the trunk without mulch. This will let the tree grow and breathe.