Originally posted on Garden Walk Garden Talk:

Today is rainy, windy and 49 degrees. The nights have been 37 degrees. So, did you ever wonder about the changing leaves in regards to the weather? In regards to daylight?

We all probably learned it in school, but most likely don’t remember the specifics. The picture to the left was taken of my Redspire Pear today. Cold, windy  and rainy.

For many years, scientists have tried to fully understand the changes that happen to trees in the Autumn.

As the days grow shorter and the nights grow longer, biochemical processes in the leaf begin to paint the landscape awash with  glorious color.

These chemicals are responsible.

  • Chlorophyll for greens
  • Carotenoids for orange
  • Xanthophyll of the Carotenoid group for yellow
  • Anthocyanins for reds and purples
  • Tannins for brown as a waste product

The image below was taken on Garden Bloggers Bloom Day, a balmy warm day in the 60’s with…

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