There's no doubt in my mind about the 'placebo' effect!
We want our plants to look better, so then we think they do.
It's human nature, and that's what has made the Superthrive people rich. We want all that bull on their label to be true.
I love to go away for a week, then when I come back I can really see the changes. Barring a trip, taking pictures is good, too.