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Ask an Arborist: Why Do Leaves Change Color?

Autumns boasts spectacular displays of fall color. Learn the science behind why leaves change color.
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Media Name: fall-leaf-color-1.jpg

Autumn Color

Scientists don't yet fully understand all of the complicated actions and interactions that produce the spectacular displays of autumn leaf colors that are a highlight of the fall months. Although not fully understood, several factors affect when and how tree leaves change color and the hues they produce. These factors include:

  • Shortening of day length
  • Cooling temperatures
  • Organic pigments in the leaf cells
  • Sunlight intensity
  • Moisture
  • Tree genetic traits
  • Site characteristics
  • Latitude and altitude

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