Green?............GO!....................
Oh, no. “Day of the Triffids”, by John Wyndham, is the tale of autonomous and sentient plants, with the capability to move of their own volition, and the day a green comet crossed the sky, all humanity was stricken blind, except for one person who had been undergoing eye treatment, with his eyes bandaged, and so was unable to see the green comet display. The triffids, themselves without a sense of sight, were then on a common footing with humanity, and a great conflict arose as the triffids were attempting to be the dominant species.