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He invited me to perform the simple experiment of growing two plants
Stop right there. That's not a proper experiment. When you're dealing with living things, you need very large sample sizes.
By inviting you to perform the experiment yourself with only two plants, he's making it a 50-50 crap shoot as to whether he gets his desired results or not.
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I read of one experiment that supports this idea, but it was not scientifically run, no double-blind (or even single blind) methodology
Even if you could do it double blind, there's still the problem of variance in all living things. You could buy two potted plants and water them exactly the same, and one of them is gonna do better than the other no matter what.
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