in the fall because of changes in the length of daylight and changes in temperature the leaves stop their food making process. the chlorophyll brakes down, the green color disappears and the yellow to orange colours become visible and give the leaves part of their fall splendor
As the nights lengthen in the autumn, chlorophyll production slows, then stops, and eventually all chlorophyll is destroyed. The leaf's carotenoids and anthocyanins are subsequently exposed and reveal their hues.
The length of the day, temperature, and weather are all important considerations. Because chlorophyll is constantly created and broken down, leaves seem green. However, as night length grows, chlorophyll production slows and eventually stops, killing all chlorophyll. As a result, the carotenoids and anthocyanins display their hues.
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