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- fine-ass '22 harvest!
right-f'ing on pop22! 
.... here's what I wrote in response to some questions about this, and check my reasoning on it too,...>> " ....these are 100% correct scientific facts.. the problem is in part with peoples understanding of the terms "flush" and "cleanse" (Muddy chose that term well, BTW!)... Flushing does NOT mean the plant is getting some sort of internal rinsing, it's the medium that's getting extra nutes removed so the plant doesn't keep taking them in and, often, storing them... several nute elements are taken up whether the plant needs them or not, especially N; they can only store so much before toxicity issues start to take affect! ... having the plant finish "face first" means she has pretty much depleted her inner stores of nutes, including some fan leaves, which will make for better quality smoke; too much N, P, K, sugars, etc. will foul things up, and heavy feeding can lead to excess stored nutes... So, the idea is to remove the extra unwanted nutes from the medium, and have the plant forced to use up it's internals and clear out the excess... organics, being milder and slower released (due to the need for the 'crobes to break then down and get them into cycling and changed into available/absorbable forms) generally won't cause so much over-storage vs synthetics, which are generally all right-now available forms,... Muddy's use of "cleanse" is just that, it's making the plant clear out the extra's, and to do that, the medium needs to be reduced to low nute content typically (not always) for several days at least,... the part about convection might make more sense if it included transpiration in the water movement explanation,... Kudos to pop22 for this myth-buster posting!"
line. I often get a buildup around the drainage holes, expected as that is where the majority of the liquid leaves the soil, and want to know if that would clear up with something like that. I try to avoid it and when i start to see it i do a cleanse or two to get rid of the crud.
... I cleanse too, for a week or so, but flush only if there's some evidence of build-up and off pH,... I let the fan leaves tell me their storage story- 
.... I may add a hit or two of molasses during cleanse, just to hop-up the herd some and scavenge things from the soil,.. and I try to let the plant go dry by actual harvest, to speed drying some! 
So, I guess it'll depend on what kinda gunk is collecting at the drainage holes,.. is it crusty stuff, or bio-gooey? Do you use any fabric type pots? I do exclusively these days, but I can't tell much about accumulation of salts/biocrud at the base because I put perlite at the bottoms, and by removal time, it's a pulverized dirty mess down there! 
My organic mechanic brudda! ... not sure I follow you here, you talking about the osmosis reversal phenomena the book excerpt discussed above? I thought that was due to the hypertonic conditions of the medium having higher solute conc., forcing water to move out of the plant and into the media,... what you said sounds different though,...clue me in! 
Oh, timely chime in my friend, I know you have a fab' book collection,.. do you have or know anything about Marijuana Botany (Clarke), and Hemp Diseases and Pests? I'm eyeballing these books, but don't know anybody who has them,...
