Here's what was said:
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This guy is a frickin' idiot. Any person that pays attention to TV or reads knows that some pesticides used on plants can spontaneously combust if you use too much of it. It's chemistry and gardening 101. It didn't help that the plant was decomposing either. And if he had done 10 minutes of research, he would have found that out and not made himself look like a tool on national TV!
Such an article from University of Moussouri.