Animals react to secret sounds from plants, say scientists — BBC News
Trees, it turns out, have a completely different way of communicating: they use scent.
Peter Wohlleben • The Hidden Life of Trees: What They Feel, How They Communicate—Discoveries from A Secret World (The Mysteries of Nature Book 1)
So trees communicate by means of olfactory, visual, and electrical signals. (The electrical signals travel via a form of nerve cell at the tips of the roots.)
Peter Wohlleben • The Hidden Life of Trees: The International Bestseller
Trees offer considerably more than just food. Animals abuse young trees by using them as convenient rubbing posts.