I remember a book being around years ago called The Secret Life of Plants (1973), by Peter Tompkins and Christopher Bird, which argued that plants were sentient, and that agriculture should take this fact into consideration. At the time I was sceptical and believed that if they were right, then probably we would end up eating nothing and starving!
However, maybe I dismissed this claim too lightly:
http://www.naturalnews.com/2016-12-18-stunned-scientists-discover-that-plants-learn-like-humans-and-intelligently-adapt-to-their-environments-is-this-proof-of-plant-consciousness.html
http://www.naturalnews.com/2017-08-05-stunning-discovery-reveals-that-plants-and-parasites-engage-in-social-media-information-sharing-for-self-defense.html.