Trees co-operate. They communicate. They share. Not only among members of the same species, but across species barriers: Douglas firs and birches feed each other. And it’s not just trees; we now know that all plants – except for a handful of species – have this same relationship with mycorrhiza. Just as with our gut bacteria, these findings challenge how we think about the boundaries between species. Is a tree really an individual? Can it really be conceived as a separate unit? Or is it an aspect of a broader, multi-species organism?
