The answer to 'frequency of tree trimming' is that most trees should be trimmed every 3-5 years. Regular trimming helps maintain the health and shape of the tree, and prevents issues like overgrowth, weak branches, and safety hazards. Proper tree trimming involves removing dead, damaged, or crossing branches, as well as thinning out the canopy to allow for better air flow and sunlight.
The exact frequency can vary depending on the type of tree, its age and size, and the local climate. Faster-growing trees like maples may need trimming every 2-3 years, while slower-growing trees like oaks can often go 5-7 years between trims. It's best to consult with a certified arborist to determine the optimal trimming schedule for your specific trees.