m0useanswered grow question a year ago Some plants that don't feed a lot its fine for whole life cycle, but cannabis is a heavy feeder, ideally I would use just the soil for about a month and then start to mix in some dry amendments/fertilizers. or you can use a liquid feed if you wish. I like to use Gaia Green with my soil grows but it lacks Magnesium in cannabis I find and can use some extra potassium as well. 4-4-4 and 2-8-4 are their main formulations. I'd add more Mg to both 444 and 284 and only add exra K into 284.
Good Luck!