Question

why are the trees growing together taller than those which are growing on their own​

Answer 1

In short, because the collection of trees is competing for sunlight, each individual will be taller in a grove than if it was standing isolated in a clearing. Another factor is that a tree standing in isolation is fully exposed to the wind; such buffeting will result in a trunk with more curves, greater girth and less height than an identical tree that was protected from the winds.

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