There are so many variables like strain, nutrients, light, environment, skills ect. If I don't get 4 or 5 ozs. from a photoperiod plant I'm a lil disappointed. But not completely, if the end result is really good then not so much. I don't grow for yield per say I'm more concerned with quality. Quality trumps yield IMO. But that's just me I don't sell any of my crop. And have plenty to give to friends in need. My grapefruit plant yielded around 8 or 9 ozs. This is just a estimate, long as I've been growing my estimates are pretty damn close. Dry yield not wet. When I make concentrates I don't use trim I use bud. Because I can in now way smoke all of what I grow. A perpetual grow helps to never run out or even get low IMO.