The explosion of colours that greet us in fall is one of the reasons why it’s a favourite season for many people. But why do leaves turn colour in fall? To fully tell the tale of why the leaves on trees change from green to yellow, orange, red, and (sometimes) purple, we have to explain why leaves start as green! Read more
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!