Answer: Leyland Cypress will grow 15-25' wide so the distance between them can be from 8-15', depending on how quickly you want them to grow into a screening hedge. If you're planting specimen trees rather than planting them in a row, you can space them 25' apart to allow for adequate elbow room between the trees.
Plant your new trees by digging holes as deep and a little wider than the rootmass. Scruff up the soil at the bottom of the hole and the sides, then unpot your trees and loosen the root ball with your fingers. Set the trees in the holes, making sure they will be sitting at the same soil level as the were in the containers. Backfill the hole with native soil, tamp down gently, then water well to help settle the soil.
Best wishes with your new trees.
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