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https://www.nytimes.com/2016/03/03/science/a-quick-colorful-change-for-a-morning-glory.html?smid=nytcore-ios-share&referringSource=articleShare

In nature’s daily show, the morning glory is a master of the costume change. With normal fluctuations in pH levels, its petals can shift in color from blue to pink, and sometimes red in the course of a single day. But unless you camped out in front of the plant all day, you wouldn’t see the transformation.