Do plants grow faster in light or dark?
Plants require light for photosynthesis, so it is impossible for plants to increase in dry biomass without any light. From a pure growth standpoint, then, plants in the dark do not grow more than plants in the light. Some plants do not require high levels of light for growth, because they are adapted to low light conditions. Plants left in the dark will grow taller than plants in lighted conditions over a short period of time, but they will also be yellower and more spindly. The increased height is a response to low light levels – the plant is trying to grow over anything that may be blocking the light.
