In many temperate zones, the cold signals the change of the seasons and therefor a need for plants to essentially hibernate during the winter months. During this span, there is less sunlight, so many plants do not see the need to expend a ton of energy on leaf growth for so little dividends. Instead, these plants stop growing and wait until warmer temperatures to signal longer days and more sunlight. The cold weather also makes it harder for plants to absorb water and nutrients, another reason they enter a state of almost suspended animation during the colder months.
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