What's The Difference Between Thinning And Reduction?
Thinning opens up the interior of the crown by removing select branches, letting more light and air through while the tree's silhouette stays basically the same. Reduction is more deliberate about changing that silhouette, bringing down height or spread when a limb has grown into a roofline, a wire, or a neighbouring tree's space.
Is This Safe To Do On A Very Old Tree?
Done conservatively, yes - and conservatively is the operative word. An old tree has less capacity to compartmentalize a large wound than a younger one, so cuts on a mature specimen tend to be smaller and more targeted, prioritizing the tree's long-term health over a dramatic before-and-after.
Is Reduction The Same Thing As Topping?
Far from it. Topping chops the crown into stubs without regard for the tree's structure, and the growth that follows attaches poorly and tends to break off later. Reduction takes a more deliberate route, cutting back to a lateral branch capable of carrying on the role the removed section played - the tree ends up smaller, but the framework that's carried it through a century of growth stays intact.