Typically grower preference, I tend to flush for the last 2 weeks of crops, I’ve heard people push this to 3 weeks or none at all. All you’re doing is allowing the plant to use stored nutrients by flushing which on paper gives a better burn/flavour profile
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@SoulOurGarden yes that’s what Iv learned from other growers to so I gave her the second flush two days ago and it’s just about ready to be taken down, my fan leafs have turned yellow and that’s showing me that the flush is working 
My first time with that baby, Pakistan valley,
Happy growing @SoulOurGarden🙏
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