"These trees are not individuals in the sense that Darwin thought they were individuals competing for survival of the fittest. In fact they're interacting with each other trying to help each other survive." says Professor Suzanne Simard in this enlightening clip about communication between trees in the forest.
It's not "language" as we know it, but it is language in the oldest form. Chemical language! They are sending messages to each other so that they can both survive.
A network spanning the forest connects one plant to another plant through fungi. The trees shuffle carbon and nitrogen back and forth according to who needs it.
All of nature is working together, in symbiosis so that life can thrive. We unlock secrets one at a time, as we observe, in awe.