Plants look green mainly because of a pigment called chlorophyll in their cells, which absorbs red and blue light for photosynthesis and reflects green light back to our eyes.

Quick Scoop

  • Plants are packed with tiny structures called chloroplasts that contain chlorophyll pigments.
  • Chlorophyll grabs the most useful light for making food: mostly red and blue wavelengths.
  • Green light is not used as efficiently, so it is reflected or transmitted, making leaves appear green.

What makes plants green?

  • The main “green-maker” is chlorophyll a and b, natural pigments that sit in the membranes of chloroplasts.
  • Because chlorophyll reflects more green than it absorbs, our eyes see most healthy leaves and stems as green.

How light and color work

  • Sunlight contains all colors of visible light; chlorophyll selectively absorbs some colors and rejects others.
  • The absorbed red and blue light powers photosynthesis, where plants turn carbon dioxide and water into sugars and release oxygen.

Not all plants look equally green

  • Some plants appear dark green, yellowish, purple, or variegated because they mix chlorophyll with other pigments like carotenoids and anthocyanins.
  • Even then, chlorophyll is usually present and working in the background to capture light for photosynthesis, just masked by stronger colors.

TL;DR: Plants are green because chlorophyll inside their chloroplasts absorbs red and blue light for photosynthesis and reflects unused green light, which is what we see.

Information gathered from public forums or data available on the internet and portrayed here.