Question

Why don't plants grow properly in the dark?​

Answer 1

How Does Darkness Affect Plant Growth?

By Lynsey Grosfield

Plants cannot survive in total darkness. All plants, with the exception of a few that live on other organisms, use a process called photosynthesis to obtain the energy they need. The vast majority of plants are autotrophs—they are self-feeding and require sunlight to survive. They produce energy in specialized organelles inside their cells called chloroplasts. In most plants, chloroplasts are concentrated in the leaves.

Daily periods of darkness have a role to play in the growth of plants, as all plants have a cellular biological clock called a circadian rhythm: Light and the absence of light trigger different processes in plant metabolism, growth and behavior.