What happens to trees during autumn?

All perennial plants, including trees, are capable of wintering, that is, tolerating low temperatures and lack of water. Therefore, by the fall, the plants are already preparing for the wintering process. by this time they have already accumulated nutrients. The process of photosynthesis gradually stops by autumn, the leaves turn yellow and turn red and fall off. This process takes place so that nutrients are not supplied to the organs of the plant that are unnecessary at the moment. The process of sap flow also stops by winter. All these changes allow the plant to overwinter.