How do you prune a columnar English oak?

To prune a columnar English oak, start by removing any dead, damaged, or crossing branches to promote a healthy structure. Focus on maintaining the tree's natural shape by selectively thinning out crowded branches, ensuring good air circulation and light penetration. Avoid heavy pruning, as oaks are sensitive to cuts; aim for minimal intervention to maintain their characteristic form. Prune during late winter or early spring when the tree is dormant to reduce stress and promote healthy growth.