When leaves fall off of a tree naturally it means the tree is preparing itself to go into 'hybernation' (like a winter sleep) to protect itself from frost damage or it is preparing for a dry period like some trees in savannah or desert climates to protect itself from dehydration.
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They fall off.
They decompose
Autumn, or Fall. That's pretty much why they call it Fall. the leaves FALL off trees.
Evergreen trees lose only a few old leaves at a time.
In the fall. Trees pull back some moisture from leaves before they dessicate, turn brown, and fall off.
Gravity, wind, birds, squirrels
Deciduous.
because its cold and they freese and fall off
Deciduous trees fall in the Fall. The trees lose their color and lose their leaves. That's why there are many trees that are bare in the Fall.
All trees are perennial. Deciduous trees drop their leaves in the Autumn. Evergreens do not drop them at any specific time of year.
Autumn which is also called "fall" because the leaves fall from the trees.
Maple leaves turn a beautiful red color and do fall off the tree.