Stop the supply of nutrients

Where did I say anything about flushing

flushing for harvest is a myth. doesn't change chemical composition of the buds, therefore does not impact them. minerals in fertilizers are building blocks for growth. taking them away only reduces rate of growth. if toxic or some other catastrophe, flushing is a rational respons. for other things it's urban myth.

As you're using organic nutrients, by right, you can feed right up until harvest. Although it is rec that you stop a few days before harvest to let it ripen semi natural. So, when you get a loop. And you like the look of your trichs. As soon as you see any amber that's your harvest window. But, don't wait to see any either if it's all cloudy. Some phenos you actually can't see it until you take pics with PhoneS and look up close and can see the hints of amber.

With autos. You really really do need a loop mate. You risk the chances of overripe and it'll be harsh as anything on your throat. Runied 3 of my harvests this round by pushing them to fast. You'll notice a massive drop off in fluid uptake though. But, really can't be used in as a guide neither. 35-50 days it takes for an auto once it hits pre flower. I do advise you get a phonescope or loop they're like 8$ from my growstore, phonescope. Guesstimate 14-21 days