I hate to quote my own response from a earlier thread but it was easier than re-writing the whole thing...Re: "Superthrive"-More than a little debate surrounds the use of "Superthrive" and not just in the cannabis growing community. Personally, I think it is snake-oil (Superjive) and simply yet another in a long line of formulations/tonics that have no basis in good botany or agriculture/horticulture. Most of the proponents of this product use anecdotal evidence to back up the claims made by the manufacturer "man my plants really grew fast!" with little or no hard evidence to support it. I will never claim to be an expert on growing any one species of plant but I do have a BS in Horticulture/Agriculture and I once did controlled studies of "Superthrive" on the flowering perennials Dianthus, Hemerocallis and Echinacea (Carnation,Daylily and Coneflower). The study was done under carefully controlled lab.-conditions and took 10 months to complete as I recall. After the endless hours of work and tedious measurements the product contributed exactly nothing to the overall plant(s) vigor, health, disease resistance, flower number or yield. Use it if you like but I am covinced it is a waste of time and money.