Plants absolutely use green light for photosynthesis and do it quite well.

THE ACTION SPECTRUM, ABSORPTANCE AND QUANTUM YIELD OF PHOTOSYNTHESIS IN CROP PLANTS

Green Light Drives Leaf Photosynthesis More Efficiently than Red Light in Strong White Light: Revisiting the Enigmatic Question of Why Leaves are Green

Green light is in fact absorbed at a rate of 80-90%, and it penetrates much deeper than red or blue. Comparison