As the chlorophyll breaks down and the colors emerge, the tree begins to construct a special layer of cells at the base of the leaf stem, where it attaches to the branch. This is called the .
This process, known botanically as abscission, is most common in deciduous trees—species that lose their leaves annually. It contrasts with evergreens (conifers like pines and spruces), which keep their needles year-round. tree shed their leaves in
Before the leaf falls, we are treated to the autumn colors. Interestingly, these colors are not "created" in the autumn; they are simply revealed. As the chlorophyll breaks down and the colors
Simultaneously, the temperature begins to drop. This combination signals the tree that winter is imminent. In the winter, two critical things happen that threaten the tree's survival: It contrasts with evergreens (conifers like pines and
Should I focus more on the (like chlorophyll breakdown) or the geographic differences in how trees shed?
The story does not end when the leaf hits the ground. In a natural forest ecosystem, the fallen leaves are not waste; they are a reservoir of nutrients.
While light is the primary clock, temperature acts as the fine-tuner. Cooler nights, specifically those that stay above freezing but remain chilly, accelerate the breakdown of chlorophyll, leading to the vibrant colors we see before the leaves fall. 3. Arid Conditions (Dry Seasons)