Pgr,
Plant growth regulators
I don’t know much about that, but here’s a link showing which fertilisers are allowed too be used on cannabis, every product used in Washington has too be registered on this date base. It shows product analysis of heavy metals. I have found advanced nutrients and many others in here. If the company or product ain’t on here I wouldn’t use it. If ypu can’t find the company name, sometimes they register under different name, always good too ask the company first, for example house and garden is hard too find.