Care for a Leyland cypress tree by placing it in a location with full or partial sun, using well-drained soil and watering it occasionally. When first planting the tree, do so in the fall at least six weeks before the first frost. If planting more than one tree, space them between 10 and 12 feet apart.
Place the tree in a location that receives plenty of sunlight and contains rich, well-drained soil with a pH between 5 and 8. Stake a young tree to the ground to ensure straight growth by placing the stake 18 inches from the trunk attached to a 3-inch piece of rubber wrapped around the middle of the tree.
Spread a 3-inch layer of organic mulch around the tree, avoiding laying it against the trunk, which can result in rot. Water the tree well after its planted, and then only water it during hot weather around the base once it becomes established. Fertilize the tree every year in the spring with a solid tree spike or a slow-release 18-6-12 ratio fertilizer applied to the ground from the trunk of the tree to its drip line.
Prune the tree in the spring as well, removing any dead or damaged limbs. Lightly trim back any leggy or scraggly limbs throughout the growing season.