Which of the following is essential when cutting a healthy branch?

Making cuts smoothly is essential when cutting a healthy branch because it promotes proper healing and minimizes damage to the tree or plant. A clean cut helps the plant's natural defense mechanisms respond more effectively, reducing the risk of disease and decay. Smooth cuts at the correct angles encourage faster callus formation, leading to a quicker recovery for the tree. This practice ensures that the branch is disengaged in a way that allows the remaining structure to thrive.

In contrast, leaving a small stub can hinder the healing process and create entry points for pathogens. Using only a chainsaw is not necessary and can lead to rough cuts that damage bark and the branching structure if not handled correctly. Pruning during winter may be suitable for some plants but not universally applicable; the best time to prune often depends on the species and their growth habits. Thus, making smooth cuts stands out as the most universal and beneficial practice when pruning healthy branches.