Etiolation

Plants are photosynthetic and require light to survive. When plants are left in the shade they don’t die immediately though. When left in the shade, plants become etiolated. Etiolation results in stem elongation, paleness, and a lack of photosynthetic maturation. Etiolation occurs usually in plants below a canopy. Far red light is what triggers etiolation, which penetrates through the shade of the canopy. In order to reverse etiolation, all that would be necessary would be for the plant to be exposed to red light again, because red light is what activates de-etiolation.