CT'- organic soil isn't the issue here, it's your nutes, and how heavy a feeding sched' you ran,.. Fox Farm isn't organic... Generally, if your fan leaves are looking pretty well tapped into- faded, kinda crummy looking, lowers really wiped out and/or some dropped off, then your plant has been tapping into her reserves well enough,.. I'd say about a week of water only, and the last stage try to get her pretty dry,.. this will lower water content so she drys a bit faster, and a little stress like that can sometimes trigger some improvement of terp's,... it can be shorter a few days if you've been tapering off in late stages of bloom,... If she has a lot of nice looking leaves still, then reduce feeds a lot prior to "cleanse' period,... these are just broad strokes here, and there are those how think "flushing" is pointless,.. I don't agree, but it's conditional as to how much, if at all (organics),... some folks handle their synthetic nutes at the end well enough that there's little reserves left in the plant, and so do little to no 'flushing",....