That’s been my belief as well and you’re definitely right about sexual maturity. I forgot about an experiment I had last year where I threw some seeds on the ground in August to see what kind of temperatures the resulting plants could live through… not even the male’s flowered, and there must have been between 30 and 40 plants . I’ve never had it tested, but I believe my old heirloom, from which those seeds came, leans heavily towards the sativa side. Maybe indicas are different in that they hit sexual maturity faster. My friend’s brother didn’t plant until mid-august , and when he planted packed them close together . They did finish. I’m going to test the theory though. After this summer when somebody asks me the question, I’ll be able to tell them exactly what happened with three different plantings of the same landrace into the same soil, same location., as well as the experiences of those of you that decide to do a similar experiment.
Another thing I read, maybe in that same book , is that seeded plants finish before unseeded Plants. I make seeds on my best plants every year, as I have done for the last 30 years , and they finish at the same time as they always do. If you were to seed an entire plant, instead of a branch like I do, the seeded portion should finish within 4 to 6 weeks. That I could see. That bit of info seems to mesh with what we’ve been talking about