Once the seasons change and Autumn hits, trees start to undergo some very serious changes. In a sense, they are becoming dormant for the up-coming winter season.
It may appear as though a tree is completely inactive as the cold weather approaches, however this is simply not the truth. They are just regulating their metabolism and slowing down some of their physiological activities. A decrease in photosynthesis from the warmer months (spring-summer) begin the dormancy phase of a tree.
During the colder months, trees still grow, take in nutrients and respire. Albeit, at a slower pace than usual. Winter is a very difficult time for a tree. Unfortunately the cold weather encourages insects and other pests to take shelter inside for wintertime.
This is why we always encourage our clients to have their trees pruned during the fall or spring. Besides winter preparation for shrubs or trees, this is the best defense your trees can have against the elements especially during dormancy.