It is grown in Tropical Southern China. It is not wild.
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1$\begingroup$ Google image search, first result, thinks that your photo is a mexican petunia. I find the color fairly specific, and the leaves fairly dark, so i tried a google image search: google.fr/…: $\endgroup$– bandybabboonSep 26, 2018 at 6:10
1 Answer
Google images sais that it's a mexican petunia, I think it's right due to the good focus of your image, and the different attributes of the photo.
http://www.gardenality.com/ImageViewer/?id=2116&IUID=3&RID=88#imageId=2116