Leyland cypress trees are evergreen trees that grow rapidly. They are ideal as screens between homes and grow in all kinds of soil. If you are thinking about planting a Leyland cypress, you should understand that these trees will grow to heights in excess of 45 feet and have a small root system. Planting them is not difficult, but make sure to take steps to ensure they are stable.
Plant the tree at least a month and a half before the winter season so that it can adjust to its new home before the first frost.
Dig a hole with a shovel to set the Leyland cypress in. The depth of the hole will be dependent on the size of the tree. The tree's root system is fairly close to the surface so it will not be a deep hole. For a Leyland cypress of around 4 feet the hole should be about 8 to 10 inches down. Make sure the hole is wide enough so that you can cover the entire root system. Basically, you want the depth and width to hold the root system plus a little extra.
Set the tree in the hole and tuck in all roots.
Fill in the hole with soil, making sure to insert dirt around all the roots and remove any air pockets. Pack it around the tree and mound it up slightly, but not near the tree trunk. The soil will settle, and the mound will disappear after a few days of watering.
Place mulch around the tree to hold in moisture, but do not put it up against the trunk.
Secure the Leyland cypress using stakes and twine until the roots establish. Leylands tend to topple over in winds or if the earth becomes too wet. Staking the tree will stabilize it until the roots grow deeper into the soil.
Water the Leyland cypress until the soil is damp, not soggy. Water twice a week if there is no rain. Do this for several months until the tree establishes itself.