This is a pretty interesting film. Its a little bit trippy/hippie, but still tries to remain scientific.
I was inspired to watch this film after listening to the great soundtrack by Stevie Wonder and seeing what inspired the album. Little did I know I would stumble across one of the most interesting documentaries from the 1970's that has gained a cult following despite its limited release.
I can see why this film has a following especially by plant and "tree" enthusiasts even though I watched this film in an awful 360p upload on YouTube. Still if you ignore the questionable scientific methods done throughout the film you can appreciate the passionate work done by the scientists as well as the beautiful scenery throughout the film.
In short, the visuals in this film are wild and the people keep things interesting. Check it out if you can!