In the latest Discover magazine there is mention of a book published back in 1970's, The Secret Life of Plants. The author claimed that he could talk to his philodendrons, and detect their response.

Now, that is what I call bunk.

"However, a person completely ignorant of plant and animal science has
not only tested plants for perception and feeling, he claims that he has
scientific proof that plants experience a wide range of emotions and
thoughts. He also claims that plants can read human minds. His name is
Cleve Backster and he published his research in the International
Journal of Parapsychology ("Evidence of a Primary Perception in
Plant Life," 10, 1968). He tested his plants on a polygraph machine and
found that plants react to thoughts and threats."

I say again, that is bunk, bunk, bunk......