[eli5] How can trees be leaf-less all winter and even turn grey/brown but when spring comes they get small green leaves starting to grow on the edges of each branch?

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Sorry if this has been asked before I wasn’t sure how to put it in words or if there’s a name for this phenomenon, I see trees with hugh branch structure all grey but with small almost un-noticeable green leaves, do trees hibernate in winter?

Thanks!

In: Biology
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Trees that hibernate during winter are called deciduous. These plants do this to conserve energy for when they need to produce fruit, aromatics etc which takes a lot of energy.