The article also outlines the problem with terminology around plant responses to environmental stimuli. The article is too "easy" on the use of anthropromorophic terms, but it does show why this line of inquiry often ends up relegated to "crack pot" status. It is important to realize that plants have complex reactions to environmental stimulus, and that there are emergent properties from these responses, that are truely remarkable. It is difficult to use correct terminology when discussing this.
Those sentances above are so stilted, but if you talk about "plants talking to each other", you won't get taken seriously by the science community.
