When is a tree a trees?

We all know what a tree is, don’t we? But when does a tree stop being ‘a’ tree and start being something bigger, more complicated and perhaps even plural? Francis Hallé has approached the question from a morphological perspective by showing that through reiteration, trees can actually be forests, with branches functioning as individual trees or trees-in-waiting, and I was fascinated to read this paper which touches on this same question from a different perspective, showing that up to 40% of the carbon in a tree’s fine roots might actually have been produced by another tree.

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