Im using this as my main amendment this year in FFOF, along with a lot of other stuff but the rainbow grow is the main. If I need to feed them I did plan on adding it as an ingredient to a tea. I also plan on making a topdressing right into flowering with the rainbow bloom. I chose it because DoubleJJ used it in his soil mix last year with obviously awesome results. Also it seems to have a bunch of ingredients that constitute a 'supersoil", and it also says on the bag it contains tricoderma/beneficial bacteria etc. Haven't used it previous years so cant say much about personal results but I shall see in october.