trees make food during the summer from the sunlight they trap through the leaves and turn it into food, this is called photosynthesis but due to lack of sunlight during the winter, the trees store just the right amount of food to maintain the branches and the trunk but not the leaves so to save on food supply, the trees loose their leaves
During winter - trees 'shut down'. There is less sunlight - and thus their growth slows. Since their leaves are not capturing sunlight as they would in summer - the tree sheds them to conserve energy.
Deciduous trees, such as oaks or aspens, lose their leaves in the autumn.
Deciduous trees lose all their leaves in the Autumn.
Deciduous trees.
A Deciduous tree
deciduous
Trees that lose their leaves annually are called deciduous trees.
Deciduous trees lose their leaves in autumn and and winter, then regrow them in spring. Evergreen trees never lose their leaves.
Deciduous trees.
evergreen
evergreen
Trees and shrubs that lose their leaves in the Autumn.
Evergreens do not normally lose their leaves in autumn; hence "Ever-Green".