I have not heard of plants OD'ing on Superthrive but I would imagine it is close to everything else as in there is always too much you can give. As for the reason not to use during flower, when I first started using ST I posted on here that I was using it and our long lost Guru of Growing, Stinkyattic, advised me that one of the compounds in ST is not what you want the plants to get during flower. Right this min I cant remember exactly what it was that she said was the compound but I will try to look back and find the name of it for yall. I also have tried to play with ST a lil bit dosage wise, never really went way outside what they recommend and didnt really see much diff between rec dosage and what I was trying (think maybe I tried doubling but been awhile). From all that I have read about ST it seems that it is basically a vitamin boost and helps as a stress reliever. Also suppose to help with root development so using on clones and using when changing from like clone table to your main grow setup is recommended. I'll go see about finding the name of that compound.

Later :jointsmile: