Leylands prefer to be planted in full sun. They will grow in partial sun, but to reach their full potential of fullness and height, full sun is best. Dig a hole approximately 2 times the size of the root ball. Add some soil conditioner, such as Nature’s Helper. Place the tree in the hole and cover with dirt so that the top of the root ball is even with the top of the soil level. Leylands should be planted 5 - 6 feet apart for privacy screens and windbreaks.
Your trees should be watered deeply two or three times per week. When the roots are established, in about 6 weeks, you can discontinue the watering unless it is unusually hot or dry. DO NOT WATER DAILY. Too much water will cause root rot. Your tree will start to turn brown and you will assume it needs more water, but that will only worsen the problem. If this happens, reduce the water, prune off the dead limbs.
About 3 or 4 weeks after planting your trees, fertilize lightly with a general-purpose fertilizer like 10-10-10 or 13-13-13. Just sprinkle the fertilizer lightly around the drip line of the tree. Fertilize your trees quarterly for optimum growth. Leylands can be pruned to control height or width. Leylands can withstand severe pruning if necessary. Leylands are clean, hypoallergenic trees. They are drought resistant and somewhat resistant to insects. One pest that can be very damaging (and fatal) to Leylands is the bagworm. They look like small, soft cones hanging off the branches. If your trees become infected with bagworms, spray ASAP with Liquid 8 or Isotox, or other pesticide recommended by your local nursery. Leylands require minimal care and should last a long time if taken care of properly.