u r only supposed to use in the first couple of weeks of growth. its supposed to be a mild fert for young plants to give them a good start but the product description says its just a way for u to use the whole line of canna start to finish. i dunno i love canna or BioCanna rather but i dont think i would spend the money with my style of growing i dont have to fert at all for veg its all in my soil alredy i fert only for flower.