The Truth About Flushing

72Hrs Darkness before harvest:
increases THC in the Bud
The Stichting Institute of Medical marijuana (SIMM), the first company to sell marijuana through the pharmacies of Holland, has been investigating the medical possibilities of cannabis, together with TNO laboratories and the University of Leiden. One of their discoveries has been that to keep the ripe plants in the dark before harvesting could increase their potency.
SIMM’s growers separated a crop of mature plants, harvested half of them and kept the other half in absolute darkness for 72 hours before cutting and drying. Analysis of the resulting dried buds showed that some varieties had seen an increase of THC of up to 30%, while CBD and CBN remained the same.
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They should have had 3 harvests, not just 2. Some of the plants should have stayed under the 12/12 lights for those 72 hours, IMO. I use the 72 hour dark period and am sure it helps compared to if I harvested them 3 days earlier, but I am not sure it is that much better than just leaving them under the lights for those extra 3 days. With my perpetual system the extra 3 days is a no brainer, as long as it isn't a detriment to the plants in any way.
 
rasputin71 said:
They should have had 3 harvests, not just 2. Some of the plants should have stayed under the 12/12 lights for those 72 hours, IMO. I use the 72 hour dark period and am sure it helps compared to if I harvested them 3 days earlier, but I am not sure it is that much better than just leaving them under the lights for those extra 3 days. With my perpetual system the extra 3 days is a no brainer, as long as it isn't a detriment to the plants in any way.
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Its a pretty well known fact that light degrades THC. As such, it seems logical to me that the darkness would increase THC levels above levels what you would expect just leaving the lights on.
 
rasputin71 said:
They should have had 3 harvests, not just 2. Some of the plants should have stayed under the 12/12 lights for those 72 hours, IMO. I use the 72 hour dark period and am sure it helps compared to if I harvested them 3 days earlier, but I am not sure it is that much better than just leaving them under the lights for those extra 3 days. With my perpetual system the extra 3 days is a no brainer, as long as it isn't a detriment to the plants in any way.
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i agree, they needed to have a control group in the study in order to draw significant conclusions
 
So what if a flowering room is running two staggered cycles say one month apart, with two lights and 20 buckets under each light? If you did the drown method with the 5 days of no light would it negatively affect the 2nd batch that is only half way into flowering? Would it make the 2nd batch think its drowning, or is that only if you watered before you turn the lights off. Or would you just remove the 1st batch that is ready to be harvested and remove it to a separate dark area (which would be a hassle, which is why the question is about affecting the 2nd batch) OR would you just do the drown method for 10 days with the lights running and just harvest the 1st batch that way? Oh and if you keep adding water to drown the roots, arent you also adding water with dissolved oxygen that the plant can absorb or am I thinking about it wrong?
 
xochilives said:
So what if a flowering room is running two staggered cycles say one month apart, with two lights and 20 buckets under each light? If you did the drown method with the 5 days of no light would it negatively affect the 2nd batch that is only half way into flowering? Would it make the 2nd batch think its drowning, or is that only if you watered before you turn the lights off. Or would you just remove the 1st batch that is ready to be harvested and remove it to a separate dark area (which would be a hassle, which is why the question is about affecting the 2nd batch) OR would you just do the drown method for 10 days with the lights running and just harvest the 1st batch that way? Oh and if you keep adding water to drown the roots, arent you also adding water with dissolved oxygen that the plant can absorb or am I thinking about it wrong?
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OK, I see 48 hours of darkness as helpful but un-proven. But where are you getting 5 days and 10 days of darkness before the harvest?
Yea, I think 5 to 10 days would affect those halfway into flowering. That sounds like asking for them to hermie, or at the least stretch or stress.
So if this was my grow I would just drown for 5 to 7 days by putting the pot into a bigger bucket like my pic. Lights as before. Once you add a couple gallons or more of water they just need topped off by a cup or two for a day or two.
Without air stones, or some other action to aerate it I think DO in water drops fairly soon.. Some hydro guy would know better than me, but I do know that isn't an issue for this.:leaf:
RiddleMe put his research on this in his thread. He explains it so much better than I do, but hope that helps.
Daniels:weed:
 
homebrewer said:
I guess the concept that I'm trying to wrap my head around is; how is the color of the ash in ANY way related to how the plant was finished? Where did this ash color idea even come from? The wood in my fireplace burns white but my trees aren't 'finished properly' before they're cut down, so where does this concept come from? More stoner forum nonsense or did this originate in hightimes or in a Cervantes book?
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I have read Ina number of threads that the flushing helps rid the plant of the nutes and if not done ((again, I'm just repeating what others say to answer our question) if not done it can leave a taste of nutrients perhaps and some say flushing helps stop bud from having a black ash color; i.e. If flushed the bud will burn smooth and no "chemicals" "burning in the paper"
 
Explain to me how flushing with water removes Anything from the part you smoke? You flush the soil. The bud would become a puddle of water by this retarded logic. Did you read the pertinent Science of why we say this?
When an answer is "((again, I'm just repeating what others say to answer our question)" I would question it.
You don't remove any "chemicals" Once the plant has used the building blocks of any nutrient (true for organic or chemical), the cell won't just fall apart from water. All this does is make the plant starved for a couple weeks as it needs them.
But if it makes you feel better then why not parrot everyone else.
Daniels

 
lochem said:
I have read Ina number of threads that the flushing helps rid the plant of the nutes and if not done ((again, I'm just repeating what others say to answer our question) if not done it can leave a taste of nutrients perhaps and some say flushing helps stop bud from having a black ash color; i.e. If flushed the bud will burn smooth and no "chemicals" "burning in the paper"
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That's why this thread is called the truth about flushing and not what everybody says about flushing
 
I will write a detailed reply later when I have more time, but my preliminary report from my first test plant is 'this works'.
 
If you had read the part about drowning, it said to drown the roots and still have the lights on it would take 10-14 days to do this, if one wanted to drown the roots faster, it would take 5 days in complete darkness. You "think" 5 consecutive days will make plants halfway into flowering herm, what is this based on other than arbitrary convictions? Does anybody "know" firsthand what that would do or have heard/seen about it? Also, lets just say one was to remove the plants to darkness for 5 days, if you interrupted that darkness to check for mold or pests, would that have an adverse affect on you desired outcome or would it be negligible?
 
xochilives said:
If you had read the part about drowning, it said to drown the roots and still have the lights on it would take 10-14 days to do this, if one wanted to drown the roots faster, it would take 5 days in complete darkness. You "think" 5 consecutive days will make plants halfway into flowering herm, what is this based on other than arbitrary convictions? Does anybody "know" firsthand what that would do or have heard/seen about it? Also, lets just say one was to remove the plants to darkness for 5 days, if you interrupted that darkness to check for mold or pests, would that have an adverse affect on you desired outcome or would it be negligible?
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Those of us doing this have several harvest completed in this way, only one negative so far Lumi had mold caused by bringing in bricks from outside (without first bleaching them) to hold the pot down in the bucket (it wanted to float) there have been ZERO reports of hermies and we have done it both ways, lights on and darkness
 
So, your saying one could leave the lights off for five days, with little or no effect on the plants that are halfway into flowering, am i reading this correctly?
 
xochilives said:
So, your saying one could leave the lights off for five days, with little or no effect on the plants that are halfway into flowering, am i reading this correctly?
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I am saying that I have done it with no adverse effects (more than once)
 
Riddleme, thanks for the thorough post on final flush vs the drowning technique, very interesting. One question: what's the difference tween "Make It Rain" and drowning? I thought they were the same but now I'm confused.

I'm in week 8 of flowering and ready to finish up before the chop and want to try it, probably on the dark. So, you think 3-5 days of constant wetness in the dark will do them some good?

Thanks for your insights!
 
Danielsgb said:
Explain to me how flushing with water removes Anything from the part you smoke? You flush the soil. The bud would become a puddle of water by this retarded logic. Did you read the pertinent Science of why we say this?
When an answer is "((again, I'm just repeating what others say to answer our question)" I would question it.
You don't remove any "chemicals" Once the plant has used the building blocks of any nutrient (true for organic or chemical), the cell won't just fall apart from water. All this does is make the plant starved for a couple weeks as it needs them.
But if it makes you feel better then why not parrot everyone else.
Daniels

[/QUOTE
I still stand by my opinions on this whole thing,plant on rhe left watered with 1/2 tsp. peters to 1/3 gal water all the way through.Plant on the right fed same rates at same times till 2 weeks before chop at which time I merely stop the ferts and just use water.There is always a little bit of runoff but not very much.
Diff cuts the left is kinda satty while the rights scraight indica.
I am smoking hash and kinda not sure why I said what I just said............had some point to make but forgot what it was.
Needed some pics up in here anyways,have a great day fellas no matter how yer doing it.
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ashleyroachclip said:
Riddleme, thanks for the thorough post on final flush vs the drowning technique, very interesting. One question: what's the difference tween "Make It Rain" and drowning? I thought they were the same but now I'm confused.

I'm in week 8 of flowering and ready to finish up before the chop and want to try it, probably on the dark. So, you think 3-5 days of constant wetness in the dark will do them some good?

Thanks for your insights!
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answered in your pm :)
 
taint said:
Danielsgb said:
Explain to me how flushing with water removes Anything from the part you smoke? You flush the soil. The bud would become a puddle of water by this retarded logic. Did you read the pertinent Science of why we say this?
When an answer is "((again, I'm just repeating what others say to answer our question)" I would question it.
You don't remove any "chemicals" Once the plant has used the building blocks of any nutrient (true for organic or chemical), the cell won't just fall apart from water. All this does is make the plant starved for a couple weeks as it needs them.
But if it makes you feel better then why not parrot everyone else.
Daniels

[/QUOTE
I still stand by my opinions on this whole thing,plant on rhe left watered with 1/2 tsp. peters to 1/3 gal water all the way through.Plant on the right fed same rates at same times till 2 weeks before chop at which time I merely stop the ferts and just use water.There is always a little bit of runoff but not very much.
Diff cuts the left is kinda satty while the rights scraight indica.
I am smoking hash and kinda not sure why I said what I just said............had some point to make but forgot what it was.
Needed some pics up in here anyways,have a great day fellas no matter how yer doing it.
Click to expand...

must be some good hash, oh well plant on the left looks great LOL
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