I need to trim a large limb from large healthy American Elm. When is the best time?
Oakland County Michigan
Not recommended to prune or remove American elms between April 1st and Oct 1st, while the elm bark beetle is active. Best time while the tree is dormant. While most older elms have been taken out, the disease is till a concern. Read more here: https://www.arboraesthetics.com/blog/now-is-not-the-time-to-trim-your-elm-tree
I hope this helps. Thank you for your question!