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Sep 05, Losing Leaves Eventually, autumn leaves must fall. By the end of summer, they may be damaged by insects, disease or general wear and tear and ready for renewal.

Annual Report.

They are equipped to self-destruct. At the point where leaf stem meets twig or Estimated Reading Time: 7 mins. The simple answer is this: Leaves fall off trees so that the trees can survive the winter.

But the word “fall” is a bit misleading. It implies that the trees are passive this time of year, when, in fact, they are actively “pushing” the leaves off their branches.

That means trees are waiting all winter for a drink of water!

The changes in weather and daylight trigger a hormone that releases a chemical message to each leaf that it is time to prepare for winter. Dropping them gives the plant a fresh start in the spring, and the nutrients from the decaying leaves are recycled to help grow the next leafy generation. Interestingly, autumn leaves are not simply blown off trees but are separated from the plants in a highly controlled process.

Chantilly, VAGrowth resumes when warmer temperatures and longer days return in the spring. However, roots are never truly dormant. Even when only a portion of the soil is warmed, roots in the warmed region will grow, which is why fall is.

Why some leaves fall off Broadleaf trees are responsible for the colorful annual display that defines autumn. For most of the year, a bright green chemical called chlorophyll supports photosynthesis in leaves. When the days grow shorter, chlorophyll dies off and other chemicals become the main source of.