There are two types of trees, deciduous (broad leaf) and coniferous (evergreen). Deciduous trees thrive in a climate that has distinct seasonality whereas coniferous trees have evolved to live in areas that have limited seasonality. In order for leaves to grow, like say on an oak tree, a growing period must take place where the tree is in an environment that is healthy and favorable for growth. This is the spring growth period. Once fall rolls around, and the climate begins to change and get hotter, the tree sheds its leaves so that it can focus on making its bark thicker for the coming winter months. Coniferous trees have evolved to handle relatively colder weather year round, so do not have as much climactic variance as their deciduous counterparts.
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