From personal experience the last two weeks of your plants life are IMPORTANT when it comes to potency terp profile & density. So why flush in the final weeks if you're growing organically and starve your plant just to get some yellowing?
Have you ever actually ran two identical plants one with organic one with chemical fertilizer?
Cus I have with NO flush in the final week and there isn't any difference when it comes to ash color or smoke smooth/harshness The only difference I can see and tell is the chemical nutrients produced 2x more than the organic and the organic buds while not producing AS MUCH produced MUCH BETTER buds in quality. The high is longer and has a smoother onset, and I believe they smell better too.
So when you're asking yourself, should I flush or not. I guess ask yourself am I using chemical or organic?
If chemical then maybe flush for a couple days just to ease your mind that way we all feel better knowing you didn't COMPLETELY STARVE YOUR PLANT before brutally murdering her for her FLOWERS
Thats all folks