I have heard people in NorCal getting in 2 a year.
I am not positive but I am thinking the normal one of like spring to fall then I would think maybe like fall to spring but I am not sure. It seems like the plants would not get enough light to flower unless they do one like fall to winter since it dosent freeze up there it just gets a little cold.
The plant will 'veg' for maybe a couple weeks then stretch and flower. Plants from seed may not flower right away, they get to a certain height with the preflower stretch and all and then they could finish before the lighting outside would be like 'veg' liting indoors, you know what I mean, like they will finish in the winter when the light is like 12 an 12 still and is going back to 18 hrs of daylight.
I am pretty sure this would be what they are talking about.I also know a lot of people like to depo their plants, meaning they deprive them of light with black tarps to alter the outside lite for instance 12 and 12 in the middile of summer. They say they get a lot more for the stuff because it is harvested before everyone else. So everyone else is holding on to what they got waiting for their outdoor crop for the fall and others that depoed are already done!! You could get as many crops in as an indoor gardener would almost besides the fact that outdoors plants may take a little longer to finish.
People that depo also say that their plants are danker looking, like something out of a hydro indoor setup. This could just be their skill level or the fact that the plant is forced into flowering rather abruptly instead of having the light gradually shift to 12 and 12.