Most trees benefit from fine pruning or crown thinning every 2 to 3 years, depending on species and growth rate. Fast growers common on the Peninsula – eucalyptus, acacia, Monterey cypress – may need attention every year or two, especially for view clearing; slow-growing oaks and mature ornamentals can go every third year. Crown reduction is not a routine item: it is a one-time structural decision made when a tree has genuinely outgrown its space.

Two calendar anchors: young trees (under 15 years) deserve a structural look every 2 years while their architecture is forming, and any tree that dropped a significant limb deserves a professional look that same season – single failures often reveal a correctable pattern.