Just using natural soil in the ground (outdoor) and maybe adding a few nutrients. Is it possible to get 2/3 ounces with 2 plants this way?
Not too late in the year if your below the equator It depends on almost a limitless amount of factors but basically if you don't balls it up, yes, without a doubt. However if you get any of its requirements wrong then who knows. Even soil has an almost limitless amount of different consistencies and will most likely take some additives to make it better