let me share my opinion:
organic or synthetic, living soil or dead soil lol , doesn't matter. It's all about nutrient uptake rate of your plant.All minerals are transferred to leaves through stems.Living soil has its own microbe life and nutrients in it, other soil types need to be fertilized,this is the difference.In the end, all plants stock nutrients in their leaves(cannabis) and use them when needed.High amounts of nitrogen and sugar makes a harsh smoke,organic or not doesn't matter.With flush, you force the plant to use from storage instead of actively feeding roots and when trimmed well,you'll get a decent smoke.All kind of green parts taste a bit harsh.To compare,roll a joint with trimmed parts vs buds. If my plant has dark green leaves at the end,I give a good flush to make sure smoke is smoother.But,I've also had smooth smokes from non flushed plants.This is a very interesting point. But.... there is another purpose of flush ; to make the buds ripen more. I'm not looking from organic vs synthetic window, I go by my gut. If that plant was mine,I would flush for at least a week.any fading of color is good. More ripeness and no questions in my head :))