The answer to 'when to tree trimming' is that it's generally recommended to trim trees in late winter or early spring, before new growth emerges. This is the best time to prune trees because it allows the tree to focus its energy on healing the cuts and promoting healthy new growth in the spring.
Regular tree trimming is important for maintaining the health, appearance, and safety of your trees. Trimming helps remove dead, damaged, or diseased branches, and can also be used to shape the tree and encourage proper growth. It's generally recommended to have your trees professionally trimmed every 3-5 years, depending on the size and species of the tree.