What is the best time of year to prune most trees for optimal health?

Pruning most trees in winter is considered the best practice for promoting optimal health because it allows the trees to enter their growing season in spring with minimal stress. During the winter months, trees are typically dormant, which means they are not actively growing. This dormant period is an excellent time for pruning because it reduces the risk of disease and insect infestation that can occur if cuts are made during the active growing season. Additionally, pruning in winter allows for better visibility of the tree's structure, making it easier to identify branches that need to be removed to improve air circulation, sunlight penetration, and overall shape.

Pruning during this time also encourages new growth in the spring, as the tree can focus on healing and developing new leaves and branches once the warmer weather arrives. This practice aligns well with the general recommendation of avoiding heavy pruning during the fall, when trees are preparing for dormancy, as this can stimulate new growth that may not survive the winter. Pruning in the summer and spring can also expose the tree to stressful conditions and potential damage from pests and diseases, further solidifying winter as the optimal time for tree trimming.