Published in 1973, The Secret Life of Plants was written by Peter Tompkins and Christopher Bird. It is described as "A fascinating account of the physical, emotional, and spiritual relations between plants and man."Essentially, the subject of the book is the idea that plants may be sentient, despite their lack of a nervous system and a brain. This sentience is observed primarily through changes in the plant's conductivity, as through a polygraph, as pioneered by Cleve Backster. The book also contains a summary of Goethe's theory of plant metamorphosis.
That said, this book is about much more than just plants; it delves quite deeply into such topics as the aura, psychophysics, orgone, radionics, kirlian photography, magnetism/magnetotropism, bioelectrics, dowsing, and the history of science.
There is much more to learn about biology, the mind and it's abilities than "just" thinking, feeling and communicating plants. This video should provide you with the necessary inspiration to start searching for other documented facts people some how forgot to share with you.