Can a leylande-cypress be trimmed or cut without damaging the tree or sap?

Yes, Leyland cypress can be trimmed or cut without damaging the tree if done correctly. It's best to prune during late winter or early spring before new growth begins to minimize stress and sap loss. Avoid cutting into the brown, dead inner foliage, as this can harm the tree; instead, focus on trimming the outer green growth. Proper pruning techniques will help maintain the health and shape of the tree.