A Leyland cypress tree is a tall-growing evergreen that reaches a height of 50 feet with a crown spread of 25 feet. The tree prefers to grow in USDA hardiness zones 6 through 11 where the winters are mild. Plant the Leyland cypress in an open area that allows the tree to grow upward without obstacles. Leyland cypress trees grow best when planted in the fall, but are successful with a spring planting when the roots have time to establish before the hot and dry summer weather approaches.
Place the Leyland cypress tree in an area that has full sunlight for at least eight hours each day and well-draining soil. Verify there are no overhead wires or close buildings that will prevent the tree from growing upward.
Plant the Leyland cypress as soon as the soil is workable in spring. Dig a planting hole the same depth as the tree root ball and two to three times as wide, using a shovel. Work an even amount of organic compost into the removed soil to increase the soil's nutrient value and drainage.
Set the root ball of the Leyland cypress into the planting hole and pack amended soil around the roots to fill the hole half full. Fill the hole with water to compact the soil around the root ball. Fill the remaining hole with amended soil and gently pack to limit air pockets.
Water the soil around the Leyland cypress to moisten the soil to a depth of 10 to 14 inches. Continue to apply water to the tree two to three times a week the first growing season during the summer to keep the soil moist and assist with root establishment.
Place a three- to four-inch layer of organic mulch over the root ball area. Leave a six-inch gap between the start of the mulch and trunk of the tree to prevent moisture buildup that promotes root and stem rot.