You know why I liked this movie? Because I'm studying this sort of adaptation that plants are evolving. Plants are sooo much more onto then we think! They do communicate with each other, most indigenous people know they communicate with plants, and there is plenty of evidence supporting plant adaptations to hostility against them. So how long has western civilization been fucking up the earth, a few centuries? Not nearly long enough for plants to evolve completely to it, but they are. They can sense peoples, other animals, emotions. Trees have bad days. Shrubs sense happiness.
Modern science often ridicules this, not because of its "hard to repeat" experimentation but because if it's true then the basis of modern science and the basis our whole fucken civilization is flawed and highly innaccurate.
Don't believe me? Ask Cleve Backster, professional polygraph administrater and tutor. In 1966 he did a polygraph test on a plant. As you know, polygraph needles respond to electrochemical emissions when a subject feels they are threatened, ie in a situation they have to lie. First he tried to put the plants leaves in hot water, no response. Then when he thought about lighting a match under the plants leaves, the needle went berserk. He had no matches, no lighter, not even close. The plant sensed his upcoming action (walking to another room to get the lighter to burn the leaves). Just like the dog that went to the door at home as soon as his owner left work each day. The man left work each day at different times. Explanations please?
Anyway, since this first experience with the plant, Cleve has dedicated his entire life to this research. With some results that have me entirely covinced of, as the movie says, "acts of nature that none of us will ever comprehend".
So, in conclusion, judge the acting and what not, but don't ridicule the plot just yet. I don't think it's as far out and ridiculous as it seems.