A tree's woody roots, branches and twigs can endure freezing temperatures, but most leaves are not so tough. It is also very energetically expensive for a tree to run its leafy food factories in the winter, when there is often little sunlight and freezing temperatures make water transport (from the ground into the tree’s trunk and leaves) a problem. Aug 06, Learn why the leaves of your tree may fall early.
The evergreen strategy has been around a lot longer than the deciduous strategy.
Here are four reasons why trees shed their leaves in August or early fall. 1. Pests and diseases. Leaf diseases or summer pests usually make their mark by changing the color of leaves (often, yellow) and causing them to droop or wilt. Ultimately, the infected leaves fall earlier than normal. The simple answer is this: Leaves fall off trees so that the trees can survive the winter. why do some trees lose their leaves in the fall