But of course that's always dependent on the quality of the bags of weed you decided to choose, remove, and germinate/grow seeds from. If you choose the stuff that looks to have been run through a10,000 lb hydraulic press and crushed into blocks, then stored in a warehouse in northern Mexico for several months, you are probably going to be disappointed! One of my friends experimented with various seeds, including some from commercial grade weed. He grew it outdoors, and ended up at season's end with a single plant that was legitimately 14-15 feet tall and very wide! But it's finished buds had very little stickiness and trichomes. It was a VERY impressive plant that produced VERY underwhelming bud.... It was a shame, because a forest of plants that size would be incredibly productive in weight and bud size(if it produced good quality bud, which in this case, it didnt).
But we grew a few plants most years from about 1987-93, always using seeds plucked from bags of good pot, most of the bags of pot where we sourced the seeds from were bought by my partner, because he was a true-blue pothead(but I wasnt). We ended up each year with a mixture of comparably good pot(for the timeframe, compared with commercial grade). But I think the most we ever ended up with was maybe a total of 3/4 pound of dried bud in 1 season.