Tag Archive for: autumn leaves

Why Do Leaves Change Colour?

Despite what you might think, leaves don’t change colour and fall off just so you have an extra chore in the fall. The changes in the amount of sunlight, due to both shorter days and a lower sun, combined with colder temperatures to tell the trees that it’s time to go dormant. As they begin their long winter’s nap, one of the first things to slow down is the chlorophyll-making process that gives leaves their green colour. But there’s a lot more science to this story!

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