The Secret Life of Plants, a 1979 nature documentary based on the controversial 1973 book by Peter Tompkins and Christopher Bird with the same name.
Their book discusses ideas surrounding "plant sentience", a theory which describes how plants are able to experience pain and fear in a paranormal way. The theory is not accepted in the scientific community for plants do not have nervous systems, this theory is the centrepiece of "The Secret Life of Plants" which is why the book was branded pseudoscience by a number of scientists.
This documentary will no doubt be an interesting watch for those interested in a different perspective on things. It even features a soundtrack by Stevie Wonder.