What signals a tree to perparing for winter?

As temperatures begin to drop and daylight decreases in the fall, trees receive signals to prepare for winter. These changes trigger hormonal responses, leading to the production of abscisic acid, which helps the tree conserve water and energy. Additionally, the chlorophyll in leaves breaks down, revealing other pigments and causing the vibrant fall colors. Ultimately, trees enter a state of dormancy, conserving resources until spring.