The shedding of the leaf is not a passive event; it is a surgical procedure. The tree does not simply wait for the wind to tear the leaf away. Instead, it actively cuts the leaf off.

The primary trigger is the decreasing amount of daylight. As the sun sets earlier, trees detect the change through light-sensitive chemicals in their leaves. This signal tells the tree that winter—and its life-threatening freezing temperatures—is approaching. 2. Temperature Drops

When the tree receives the signal to prepare for winter, it stops producing chlorophyll. As the green pigment fades, other pigments that were present in the leaf all along—hidden behind the curtain of green—are unmasked.

The Cycle of the Seasons: Why Trees Shed Their Leaves In the natural world, the shedding of leaves is one of the most visible signs of the changing seasons. Most —such as oaks, maples, and birches—lose their foliage during autumn (fall) in temperate climates, or at the start of the dry season in tropical regions . While it may look like the tree is dying, this process, known as abscission , is actually a sophisticated survival strategy. Conservation of Resources