Water During 2 Days of Darkness?

[satch]

Cannabis needs 18 hours of light to stay in the vegetative stage....A lot of people leave the lights on 24 hours for different reasons....I do it to create heat and not have to use a heater...most people do it to get them vegging faster....I won't go into that but I will say that 99% of the people don't do it to hold back mold....

Glad you know your science, go back to growing pot in your closet.

 

[blackguy]

The plants can't actually use the water you feed them when you force them into a prolonged dark cycle. If you water prior to throwing them in pure darkness that water will just perspire right out of the plant and your humidity shoots up to a good 60% and right at the perfect time for you to get mold.

If you have your dehumidifiers and the means to prevent it, then give them a final watering.

 

[OZUT]

Glad you know your science, go back to growing pot in your closet.

This isn't an issue of science it's simple basics. If you need 24 hours of light to hold back mold, then you got a lot of issues you need to go back to and address with your grow. I'm really curious what you do when it comes time to flower them?


The only plants in my set up that get 24 hours of light are my clones when they're rooting. Once rooted they go to veg

 

[iTzJT]

I was actually just trying to point out his irrationality, although for my particular setup what I said was correct.

My girls are at 60F day and night, which is easy because lights are on during night and off during the daytime.

Ventilation runs 24/7, so the humidity gets slightly higher when lights are on because the nighttime air is more humid.

You keep them at 60 degrees? I have never heard of that low of temps. is there a reason why? Or?? hit me back. + rep for the good tips.

 

[phyzix]

You keep them at 60 degrees? I have never heard of that low of temps. is there a reason why? Or?? hit me back. + rep for the good tips.

I can get my lights closer with cooler temperatures. In fact, I can give the plants as much light as they are capable of absorbing, to the point that leaves start bleaching. Don't do that

 

[legallyflying]

There is no logical reason to go with anything other than 24hr light for clones and veg cycle, other than saving electricity, then 18 hrs is recommended. I can see no reason whatsoever to go with a 48 hrs dark period to kick off flowering and see it as most likely detrimental. 24hr to 12hr is the way to go.
As far as mold... Come on guys... Humidity, air circulation, and spacing!!!
One of my favorites is likening the female mj plant to an olympic sprinter, any miscue, no matter how small will almost surely mean no medal.

Please refrain from posting if you don't know what the hell your talking about. The greatest percentage of root growth occurs at night when respiration is occurring and the plants are actually using sugars for development through the combination of oxygen and sugars to produce ATP and "exhalation" of co2. Yes, you can certainly run plants on 24 hours. Many people do. Many people do allot of things. I have done both and have witnessed other trying both. Plants have adapted over milenia to survive. Part of that survival includes rapid root growth in the winter and spring (when soil temps are high enough). Google nighttime root development and see what you come up with. Don't just read a couple posts on here and think that is the gospel cause quite frankly, there is PLENTY of mis-information going around.

In actuality, there is no reason TO go lights on 24 hrs. Less root growth, higher plant stress, and greater electric bills. The slight decrease in veg growth will more than be compensated for by increased root growth. If you have to leave your lights on to maintain temps I'm sorry that you can't dial in your grow room. Ventilation and humidity are the proper ways to control mold, not temperatures and light saturation. But what the hell, its not like I studied plant ecology and plant physiology in college and have worked the last ten years as a restoration ecologist.

But if your heard headed enough to just say nu-uh, then here is some good reading links.

http://www.bonsai4me.com/AdvTech/ATPhysiology.html

http://www.canr.msu.edu/vanburen/rootgrow.htm

http://treephys.oxfordjournals.org/content/18/8-9/615.full.pdf

http://books.google.com/books?id=uFE2_-Hr6IoC&pg=PA226&lpg=PA226&dq=nighttime+root+growth&source=bl&ots=tdOQj9waS3&sig=Gn4BpzxmK7SArRgY1jSeq32Rafs&hl=en&ei=1JwTTZvXHpCosQPQoKmwAg&sa=X&oi=book_result&ct=result&resnum=2&ved=0CCYQ6AEwAQ#v=onepage&q=nighttime root growth&f=false

http://aob.oxfordjournals.org/content/94/5/647.full

 

[Holden Caufield]

Legal... Hey thanks for the great insight, when I start growing roots instead of big fat nugs I will certainly take your advice.

 

[rasputin71]

This thread got major derailed.

Should I water my plants prior to putting them in the 2 days of darkness prior to flowering? Or should I leave them bone dry?

Why would you go from giving them 6 hours of darkness to 48 hours, right before flowering? 8 times longer than normal? Then switch back to 12 hours? You are just curious how much stress a plant can take?

In nature the photoperiod changes gradually. My plants get one day of transition lighting for 15 hours before they get their first 12 hours of darkenss

What is the benefit of 2 days of darkness? .......

My guess would be Hermaphrodites.

 

[Holden Caufield]

Please refrain from posting if you don't know what the hell your talking about. The greatest percentage of root growth occurs at night when respiration is occurring and the plants are actually using sugars for development through the combination of oxygen and sugars to produce ATP and "exhalation" of co2. Yes, you can certainly run plants on 24 hours. Many people do. Many people do allot of things. I have done both and have witnessed other trying both. Plants have adapted over milenia to survive. Part of that survival includes rapid root growth in the winter and spring (when soil temps are high enough). Google nighttime root development and see what you come up with. Don't just read a couple posts on here and think that is the gospel cause quite frankly, there is PLENTY of mis-information going around.

In actuality, there is no reason TO go lights on 24 hrs. Less root growth, higher plant stress, and greater electric bills. The slight decrease in veg growth will more than be compensated for by increased root growth. If you have to leave your lights on to maintain temps I'm sorry that you can't dial in your grow room. Ventilation and humidity are the proper ways to control mold, not temperatures and light saturation. But what the hell, its not like I studied plant ecology and plant physiology in college and have worked the last ten years as a restoration ecologist.

But if your heard headed enough to just say nu-uh, then here is some good reading links.

http://www.bonsai4me.com/AdvTech/ATPhysiology.html

http://www.canr.msu.edu/vanburen/rootgrow.htm

http://treephys.oxfordjournals.org/content/18/8-9/615.full.pdf

http://books.google.com/books?id=uFE2_-Hr6IoC&pg=PA226&lpg=PA226&dq=nighttime+root+growth&source=bl&ots=tdOQj9waS3&sig=Gn4BpzxmK7SArRgY1jSeq32Rafs&hl=en&ei=1JwTTZvXHpCosQPQoKmwAg&sa=X&oi=book_result&ct=result&resnum=2&ved=0CCYQ6AEwAQ#v=onepage&q=nighttime root growth&f=false

http://aob.oxfordjournals.org/content/94/5/647.full

Okay Mr. Smartypants, I mean legally pompous, or should I say Mr. guy that really should watch what he posts cause he thinks he knows a hell of a lot more than he really knows since he only has a very limited practical knowledge of growing marijuana…. Be nice Holden…… Sorry, but you know how I hate “ phonies”.
Well sports fans, you judge for yourselves just who it is that knows “ what the hell they are talking about”.
Right away I would like to state that I, Holden Caufield, last I checked had earned(not to mentioned paid for by growing weed) a few letters like Ph and d after my name that came from a couple of really high buck schools. This, however, is not the reason why any of you out there in “webland” should give two shits about what this 30 year veteran bud grower, oh did I mention that I am a retired grower, yep, I no longer need to work because I was very damn good at what I did, has to say. No, there reason that you should at least throw a little bit of respect my way is the fact that I am A THIRTY YEAR VETERAN GROWER with a knowledge base that comes from a combo of “book learning” , and…. years of good old hands in the dirt(soil)/rockwool pot growing! Remember this, Legalbeagle, or whatever your name is, hope you don’t mind , but I’m going to call you “pompous new guy growing under the shield of so called legality“. There are many growers out here like myself that risked our freedom and, sadly, many who lost theirs, fighting to provide our brothers and sisters with huge, sticky, stinky nuglets only to have someone like legaleagle, I mean Mr. Pompous, who has decided that since it is suddenly way cool to be a pot grower, and since it is now quasi-legal(thank you to all that have given years in prisons to get us here) that he had better take his degree? and the vast amount of knowledge gleaned from growing his one pakalolo crop, and run right out to an internet forum to tell idiot newby growers with nothing to offer, like myself, to “Please refrain from posting if you don’t know what the hell you are talking about”.
Here are the plain old facts… Plants respire during the light cycle as well as during the dark cycle, the light cycle respiration is simply overshadowed by a process called photosynthesis, but a pot plant still respires during the light cycle just as it does during the dark cycle. This is a fact. Marijuana is known as a C3 plant. C3 meaning that it uses CO2 only during photosynthesis(lights on). If the plant is given enough light and proper nutrients the growth rate will remain steady without darkness(24 hour light) throughout the veggy cycle, and, if given supplemental CO2, say 2000ppm, growth rates will actually accelerate thus increasing yield, again, as long as the light intensity is sufficient and proper nutrients are provided. The “dark reaction” is a process of photosynthesis that uses ATP and NADPH molecules to utilize energy taken from light to break down CO2 into it’s base components which the plant can then readily use for growth. The “dark reaction” occurs during both light and darkness.
All this mumbo jumbo means that as long as your little girls are given all the light, good food, and CO2 that their little green hearts desire they do not need darkness, and in fact, will spend more time actually growing. Meaning you get bigger, better buds! Pot plants are not like humans or even dogs for that matter, they do not need to sleep, they do not get tired. In the little life of your pot plant light literally means growth. The more light, the more growth. The one concern that going 24/7 the entire veggy cycle does bring is that depending on your “genetics of choice” the switch from 24 to 12 hours of light may give your babies a bit more stress than the less radical shift from 18 to 12. This tiny potential negative is more than made up for by the fact that running 24/7 will give you a better yield and will simply reduces the chance of equipment malfunction. I have rarely if ever seen equipment just stop running, in my experience things will fail to start rather than stop working. 24/7 eliminates the start, stop factor. Like Mr.Pompous recommends, don’t just take my post as the truth or as being “right” all by itself. Look into what people like Ed Rosenthal, or Mel Frank have to say on the subject. I wonder if legal beagle even knows who they are?
I have in the past run 18/6 cycles because of the need to have ballasts, fans, etc. silenced for the sake of stealth, or to eliminate the ops heat signature in an effort to hide from “the pigs in the sky” invading my privacy, AKA thermal imaging helicopters. FYI “the pigs in space” will generally take to the air a couple of hours after sunset and depending on the area will not spy on you much after midnight.
I am sorry for the tone that my post has taken, but people like legally pompous make me crazy mad because while by way of the state he resides in he feels(falsely I may add) that he is immune to prosecution, while someone doing the exact same thing in another region of our same United States will face jail or prison if discovered. This is wrong people! Either all legal or all illegal! We should all swim together, like a big grower buddy system. All you “legal growers” should put aside 10% of your harvests to aid those of use that are still being persecuted!
PEACE.

 

[the cloner]

Okay Mr. Smartypants, I mean legally pompous, or should I say Mr. guy that really should watch what he posts cause he thinks he knows a hell of a lot more than he really knows since he only has a very limited practical knowledge of growing marijuana…. Be nice Holden…… Sorry, but you know how I hate “ phonies”.
Well sports fans, you judge for yourselves just who it is that knows “ what the hell they are talking about”.
Right away I would like to state that I, Holden Caufield, last I checked had earned(not to mentioned paid for by growing weed) a few letters like Ph and d after my name that came from a couple of really high buck schools. This, however, is not the reason why any of you out there in “webland” should give two shits about what this 30 year veteran bud grower, oh did I mention that I am a retired grower, yep, I no longer need to work because I was very damn good at what I did, has to say. No, there reason that you should at least throw a little bit of respect my way is the fact that I am A THIRTY YEAR VETERAN GROWER with a knowledge base that comes from a combo of “book learning” , and…. years of good old hands in the dirt(soil)/rockwool pot growing! Remember this, Legalbeagle, or whatever your name is, hope you don’t mind , but I’m going to call you “pompous new guy growing under the shield of so called legality“. There are many growers out here like myself that risked our freedom and, sadly, many who lost theirs, fighting to provide our brothers and sisters with huge, sticky, stinky nuglets only to have someone like legaleagle, I mean Mr. Pompous, who has decided that since it is suddenly way cool to be a pot grower, and since it is now quasi-legal(thank you to all that have given years in prisons to get us here) that he had better take his degree? and the vast amount of knowledge gleaned from growing his one pakalolo crop, and run right out to an internet forum to tell idiot newby growers with nothing to offer, like myself, to “Please refrain from posting if you don’t know what the hell you are talking about”.
Here are the plain old facts… Plants respire during the light cycle as well as during the dark cycle, the light cycle respiration is simply overshadowed by a process called photosynthesis, but a pot plant still respires during the light cycle just as it does during the dark cycle. This is a fact. Marijuana is known as a C3 plant. C3 meaning that it uses CO2 only during photosynthesis(lights on). If the plant is given enough light and proper nutrients the growth rate will remain steady without darkness(24 hour light) throughout the veggy cycle, and, if given supplemental CO2, say 2000ppm, growth rates will actually accelerate thus increasing yield, again, as long as the light intensity is sufficient and proper nutrients are provided. The “dark reaction” is a process of photosynthesis that uses ATP and NADPH molecules to utilize energy taken from light to break down CO2 into it’s base components which the plant can then readily use for growth. The “dark reaction” occurs during both light and darkness.
All this mumbo jumbo means that as long as your little girls are given all the light, good food, and CO2 that their little green hearts desire they do not need darkness, and in fact, will spend more time actually growing. Meaning you get bigger, better buds! Pot plants are not like humans or even dogs for that matter, they do not need to sleep, they do not get tired. In the little life of your pot plant light literally means growth. The more light, the more growth. The one concern that going 24/7 the entire veggy cycle does bring is that depending on your “genetics of choice” the switch from 24 to 12 hours of light may give your babies a bit more stress than the less radical shift from 18 to 12. This tiny potential negative is more than made up for by the fact that running 24/7 will give you a better yield and will simply reduces the chance of equipment malfunction. I have rarely if ever seen equipment just stop running, in my experience things will fail to start rather than stop working. 24/7 eliminates the start, stop factor. Like Mr.Pompous recommends, don’t just take my post as the truth or as being “right” all by itself. Look into what people like Ed Rosenthal, or Mel Frank have to say on the subject. I wonder if legal beagle even knows who they are?
I have in the past run 18/6 cycles because of the need to have ballasts, fans, etc. silenced for the sake of stealth, or to eliminate the ops heat signature in an effort to hide from “the pigs in the sky” invading my privacy, AKA thermal imaging helicopters. FYI “the pigs in space” will generally take to the air a couple of hours after sunset and depending on the area will not spy on you much after midnight.
I am sorry for the tone that my post has taken, but people like legally pompous make me crazy mad because while by way of the state he resides in he feels(falsely I may add) that he is immune to prosecution, while someone doing the exact same thing in another region of our same United States will face jail or prison if discovered. This is wrong people! Either all legal or all illegal! We should all swim together, like a big grower buddy system. All you “legal growers” should put aside 10% of your harvests to aid those of use that are still being persecuted!
PEACE.

i agree all 4 one