Why not 24hrs. light during VEG.

simple....
stress...
would you want to never sleep?
which temp are you most comfortable at?
keep it simple...

no but i would eat none stop if i could.

if i ate 24/0 id be bigger than if i ate 18/6. i might be dead though if i ate at the rate i eat meals.

but if i ate somewhat slower id constantly take in energy and that would store as fat making me absolutely MASSIVE. i like 24/0 during their adolesense then 20/4 at 5-6 in then 18/6 at 7-8 then i top to like 5-6 then go 12/12

it works for me and if 18/6 or 24/0 the whole way works for you thats cool

Cannabis clearly doesn't 'need' a dark period during vegetative growth or else there would not be so many successful grows using a 24/0 photoperiod. However as moneybags points out there is a role for stress here...

The dark period is used to maintain the plant's cirrcadian rhythm, it's biological clock as it were. Plants need/want to know that they are going from one day to the next for a lot of physiological reasons [I studied this at MSc level you can trust me on this]. In simple terms there are probably no subspp of Cannabis that do not get a dark period in any 24 hours and so I always give them at least 2 hours dark in any 24 whilst vegetating.

Incidentally; the 'dark reaction' is not reliant on dark - it is now known as the 'light independent' reaction because it is simply that, it occurs whether light is present or not and as such you do not need to put plants in the dark to have this 'dark reaction' take place [If you did then no one would run 24/0 as they'd die extrememly quickly].

good educated answer there my friend. ill consider the 2 hours but idk i like the boost plants receive from the shortening of the light cycle
i guess i could try 22/2 , 20/4 , and 18/6 though

Indeed, they don't need it but science would suggest no dark cycle is a stress and Uncle Ben recommends a dark period in his pointers thread within this forum [I hadn't even finished high school when I was reading Uncle Bens advice on Overgrow - he knows his stuff].

haha yeah man i turned 20 3 months ago i started growing when i was thirteen just throwing some bagseed in paper towels and planting em hahaha never expected bud just wanted to see some plants
ended up planting 30+ germinated seeds only harvested 3 plants but got 6 oz not too much but it had me hooked been in love ever since

one thing ive learned is everythings worth listening to and but maybe only 5 percent is viable and worth adhering to hahaha

kid cannabis said:

one thing ive learned is everythings worth listening to and but maybe only 5 percent is viable and worth adhering to hahaha

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Probably the most simple but profound principle in growing.

ATP or Adenosine Triphosphate, a key regulator for the Photosynthetic
process and main energy-transfer molecule in the cell
is only created in the off-cycle... When your plant is working on
what is called "cellular respiration." It is a light independent reaction
meaning it happens at night when the plant isn't burning energy on other
reactions..... Yes light INdependent reactions can occur whether light is
present or not, but the reactions take place more efficiently when there
aren't other obstacles, and the plant will do them more efficiently
during the period it has evolved to do them... the Dark period

It's not as if your plant is only processing the foods you give it during
the On Cycle... Your plant has important tasks it must do during the off
cycle..

But yea sure, all these closet horticulturalists seem to know
how a plants metabolism and their physiology works better than
Melvin Calvin..... So go ahead and veg for 24 hours a day

You kind of got most of that wrong tbh Shrubs

Hope I can help out a bit more...

ATP or Adenosine Triphosphate, a key regulator for the Photosynthetic
process and main energy-transfer molecule in the cell is only created in the off-cycle... This is incorrect.

When your plant is working on
what is called "cellular respiration." Cellular respiration occurs in all living cells - all the time unless frozen solid.

It is a light independent reaction
meaning it happens independently of light, not in the exclusion of light, it has never been thought of as exclusive to light it was called the dark reaction because it occurred at night as well as day whereas carbon fixation [light reaction] didn't.

at night when the plant isn't burning energy..... The plant is burning energy all the time, cells respire -all the time. You have made the same mistake that all closet horticulturists do and think that photosynthesis is the processing of food, oddly enough the word photosynthesis means creating food, it is respiration that burns it. They are two distinct reactions that people always manage to think of as one in plants. Photosynthesis is like us getting groceries into the fridge, respiration is going to the fridge and eating the groceries and using the energy for 'growth'.

It's not as if your plant is only processing the foods you give it during
the On Cycle... Your plant has important tasks it must do during the off
cycle..

But yea sure, all these closet horticulturalists seem to know
how a plants metabolism and their physiology works better than
Melvin Calvin So go ahead and veg for 24 hours a day It is a nice large picture of the calvin cycle showing a process dependent on light and shows nothing that needs dark .

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I figure the plant gets to work hard for the first 4-6 weeks. then it gets 12hr of sleep the rest of it's life.

I get confused just thinking about this shit. I look at it like this though, mother nature always knows best. The moon is always out at night and where Im at its bright as fuck. Whether or not U have a light around you, you still are always able to see quite a bit at night. Put two and two together , the plants dont have to have COMPLETE darkness durring veg or bloom. I believe that if we give complete darkness(12/12 or 18/6) we only supercharge the results. I try to mimic nature as much as possible, so I do veg at 18/6. Complete darkness on 12/12 and 18/6.

Trying to mimic nature is usually best, the reason why plants aren't fazed by moonlight is because light in this particular instance is received by phytochrome receptor that responds to the ratios of red/far red light. I doubt it would matter how bright the moon was the plants wouldn't mind since the spectrum of light is important more than the total irradiance of it.

I've weighed the pros and cons of 24/0 and the reason I've stuck with it is the shorter internodes compared with 18/6. I know that having a few hours of darkness would probably be good for my plants but with around 2.5-3 feet of vertical space I could only grow the shortest indicas with anything less than 24/0...

This got me thinking of light rails where the plants will momentarily be in dimmed light, surely this would mean that the plants would have some time todo there dark thing. Or does the darkness have to be for a longer period of time and (or) be completely dark

J.cun.Shallow said:

This got me thinking of light rails where the plants will momentarily be in dimmed light, surely this would mean that the plants would have some time todo there dark thing. Or does the darkness have to be for a longer period of time and (or) be completely dark

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good question, but i think with a rail they still get a good amount of light when its at the other end of the rail. unless you use a 30 foot rail

18/6 It saves on electricity. The plants naturally go into sleep mode even on a 24/0 time. The rest allows for faster root growth and healthier plants. We all know more roots = a better plant! So if the plant naturally sleeps and absorbed little to no light @ that time, you might as well turn off the light.

my .02

seasmoke said:

A suggestion if I may....could one of you 18-6 growers take one of your plants(male of course), and saw through the soil vertically, .....

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Photo #10 should do it.

https://www.rollitup.org/general-marijuana-growing/9114-spin-out-chemical-root-pruning.html

As I've told every new crop of newbies that drums up this timeless debate for the last 10 years, plants do better with a rest. This 24/0 thingie is symbolic of the (feel-good) need for growers to push their plants (and usually end up screwing up the results compared to others that follow normal plant culture.) More light, more nutes, more water, etc. DOES NOT guarantee better results, it actually works against the grower. You need to find out your garden's light saturation point and go from there. If you don't understand the concept of light saturation, then you're pissin' up a rope no matter what photoperiod you use.

Male at 4 weeks veg using 20/4:

UB is the man, I concur! A friend of mine ran this experiment and the plant that had 18/6 veg looked much healthier. Just like us, your plants to "breathe" and they do that mostly after the lights go out. Ever walk into a grow room after the lights have been on all day? About 15 minutes after the lights are off, you can actually smell the transpiration taking place. That's what you want.

There's a lot of conflicting information on this root growth in the dark concept. Side by side tests I have pulled up show this is not the case. The only relevance I conclude is growth rate, amount of stretch, and the plants haste to jump into flower.

I take visual representations more seriously than what some proclaimed master grower says any day.

yeah..plants breath O2 in the night and its a good thing...



But i saw a thread once.The grower did experiments on light schedules, and he confirmed that the best veg schedule was the 20-4 one...it was on another community and based on his post and rep i believed him..i did my first grow with 20-4 schedule and i was pleased..but if an electricity is an issue then 18-6 is the way to go