Kruunukavennus

Kruunukavennus, or crown reduction, is a pruning technique used in forestry and horticulture to decrease the size of a tree’s crown by shortening selected branches. The goal is to control overall size and shape, improve structural form, enhance light penetration to the lower canopy or understory, and reduce wind resistance. It differs from crown thinning, which removes branches to reduce density, by specifically shortening the crown rather than simply removing interior branches.

The method involves selecting well-placed branches and cutting back to a suitable lateral branch or the main stem, ensuring the cut is made at a point that preserves natural growth form. Cuts are typically made to stimulate a well-formed residual branch structure and to avoid leaving weakly attached or flush cuts. Practically, it is recommended to limit the amount of reduction and, in many cases, to spread substantial reductions over multiple years to minimize stress and abnormal regrowth.

Timing and species considerations vary. In temperate climates, crown reductions are commonly performed during the dormant season for many species, but some trees may require timing adjustments based on growth cycles, health, and fruiting habits. Proper technique is essential to reduce the risk of decay, sunscald, or structurally weak regrowth. Regular inspection after pruning helps manage any reaction growth and determine whether follow-up work is needed.

Applications include urban forestry where trees must be kept within space constraints or near infrastructure, as well as ornamental and fruit trees where height and breadth control improves form, accessibility, or harvest. As with other pruning, kruunukavennus should be performed with clean tools and according to species-specific guidelines.