I know passions run high with this topicā¦.and all that matters is some good bud at the end of the grow. Personally, Iāll start to flush when I decide to smoke my soilā¦..but not until then.
If I had to flush, Iād make sure my plants were ripe going in and/or there were plenty of green left for reserves. The last thing u want is to start starving a plant just as the buds are getting ripe and swelling up.
Iād be more inclined to let the buds get ripeā¦meaning no new pistil production and all hairs have turned color and recededā¦.then give water only for the last watering and flush it with as much as you like. Then you could do the 48hr darkness thing if you prefer.
When it comes right down to it, if your buds are ripe, you can run 3 gallons or 30 gallons through it and call it a dayā¦..neither will do much harm or good.