I recently watched a video were Dr. Suzanne Simard. She is a professor of forest ecology and teaches at the University of British Columbia. She has tested theories about how trees communicate with other trees. Her work has shown that trees of different species will trade and share resources with each other. Simard research determine that trees communicate by sending chemical and hormonal signals to each other via the mycorrhizal mycelium Her research determine that trees that need more carbon, nitrogen, phosphorus and carbon, will get those resources from other trees. Her research further determined that trees that have some resources to spare, will send elements back and forth to each other until the entire forest is balanced. This is a inspiring discussion of the below ground of world of plants and how it works.
You can watch her video at https://youtu.be/Un2yBgIAxYs