Based on a recent talk I heard regarding plant microbiology, it sounds like bacteria and other microbes will inhabit the surface of your leaves in a typical grow situation, so it would be desirable to make sure the inhabitants are beneficial. I don’t have the evidence to back that up on hand but it made sense to me at least as a preventative against pathogens. That being said I’m a fan of Hydroguard and have been for many years.
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