I always thought, perhaps incorrectly, that the yellowing of the fan leaves at the end of the flowering period was a last ditch effort by the plant to reflect as much light as possible towards the fruits which allow for maximum seed ripening. It just seemed that some strains did this more than others, perhaps the Indica dominant strains that evolved in lower light conditions, and thus it is a "genetic" event that is not dependent on soil nutrients.
Some people don't feed for the last 2 weeks, both fertilizer solution and CO2, and I guess you could call that "starving" the plant, but really the use of that word makes it seem overly dramatic.
I just don't want a beginner to see yellowing leaves and immediately jump to the conclusion that something is wrong. Yes, it is possible that something is wrong, such as nutrient lock-out due to pH issues, or P deficiency, but many strains just do this for an unknown reason. Again, I could be wrong, and you could argue that yellow leaves are an indication of some sort of environmental stress and therefore should be investigated thoroughly.
Maybe this is off-topic, but I saw a few people discussing it so I thought I would write this.
kind regards from guineapig
Some people don't feed for the last 2 weeks, both fertilizer solution and CO2, and I guess you could call that "starving" the plant, but really the use of that word makes it seem overly dramatic.
I just don't want a beginner to see yellowing leaves and immediately jump to the conclusion that something is wrong. Yes, it is possible that something is wrong, such as nutrient lock-out due to pH issues, or P deficiency, but many strains just do this for an unknown reason. Again, I could be wrong, and you could argue that yellow leaves are an indication of some sort of environmental stress and therefore should be investigated thoroughly.
Maybe this is off-topic, but I saw a few people discussing it so I thought I would write this.
kind regards from guineapig 
