Is 24 hours of light continuously 24/7 bad for my plants??

[jlve187]

I have about 9 plants and they are seedlings about 6 days old getting big now but i havent gave them a rest yet i was thinking about giving them about 6 hours of darkness tonite because they been going for 24/7... What do you guys think??? Is 24/7 to much for them and should i give them a resting period?????:jointsmile:

jlve187 Reviewed by jlve187 on 05-10-2009. Is 24 hours of light continuously 24/7 bad for my plants?? I have about 9 plants and they are seedlings about 6 days old getting big now but i havent gave them a rest yet i was thinking about giving them about 6 hours of darkness tonite because they been going for 24/7... What do you guys think??? Is 24/7 to much for them and should i give them a resting period?????:jointsmile: Rating: 5

[the image reaper]

that is the oldest argument in growing ... in MY opinion, plants need the dark cycles to reach their full potential ... I can't give hard evidence supporting that, but after a lifetime of growing, and trying alternative methods, I still use 18/6 for vegetative period, and 12/12 for the flowering period ... I just haven't seen improvement by moving much off that schedule ... cannabis is so tough, it will adjust to damn near anything, but there's nowhere on the entire planet, that is fully lit 24 hours a day (except, maybe Las Vegas ) ...

but, here's a VERY interesting theory, on using light periods, to influence the sativa characteristics, by DJ Short, the famous breeder ...

Breeding tips | Cannabis Culture Magazine ... thought-provoking :smokin:

P.S. - young seedlings, transplants, and clones probably need the darkness most ... the plant is busier building a root system, when not photosynthesizing the light ...

[oldmac]

I have about 9 plants and they are seedlings about 6 days old getting big now but i havent gave them a rest yet i was thinking about giving them about 6 hours of darkness tonite because they been going for 24/7... What do you guys think??? Is 24/7 to much for them and should i give them a resting period?????:jointsmile:

Hey jlve187,
There is no harm done to a plant by vegging at 24/0, 24/7.
I've used both 24/0 and 18/6 and it really is a personnel choice or what works best for you in your situation.

Hello ImageReaper,
Thank you so much for stating clearly that your answer was your opinion.

I think when people say that it needs a "rest" period, they are projecting thier human needs onto the plant. I also believed they needed a rest period, up to a few years ago when I took some botany classes at the local community college. Found out our beloved plant did not grow anything at night, not even roots.

Think about running a clonner....weak, blue biased light, 24 hours a day....to root cuttings. The interesting thing is, if you root cuttings using 12/12, it will work but root growth is much slower. If they laid down roots during the dark period the 12/12 should grow roots faster. (unless the plant is confused, not knowing to root or bloom?)

[jlve187]

Hey thanks helps me alot!!! i have another question though i have them in 8 oz plastic cups and i just looked on the bottom of the cups and i can see the roots they are touching the bottom and some of them are like becoming legnthy on the bottom ya kno....Should i transplant them into a bigger pot now or should i wait a few more days??? They are only 5 days old... I planted them on may 5th....around 3:30pm eastern time usa....Any replys would be great!!!:jointsmile:

[Rusty Trichome]

I think when people say that it needs a "rest" period, they are projecting thier human needs onto the plant. I also believed they needed a rest period, up to a few years ago when I took some botany classes at the local community college. Found out our beloved plant did not grow anything at night, not even roots.

What kind of plant did y'all grow? I'm guessing it wasn't even close to the cannabis species, with different native habits, growing conditions, nutrients and such. Galss container to monitor roots? C'mon...more info...

Although Image said it was his opinion, and you acknowledged his saying it was his opinion...I'm surprised to see you jump in with your opinion as if it were fact. This debate has raged on forever because there is ample suggestions for supporting both sides, and most of us that believe in the darkness period (me included) are, at the very least, mimicking the general conditions in nature, without risking developmental stress. (and a larger electricity bill) So without supporting documentation, your words will have be added to the 'darkness not necessary' category.

In other words...the next time you decide to slam someone else's opinion, how about showing your proof?

Too many cannabis fables...not nearly enough documentation.

[syde00]

but there's nowhere on the entire planet, that is fully lit 24 hours a day (except, maybe Las Vegas ) ...

the artic circle actually gets 24 hours of light between june and august! good luck growing MJ in -40C weather though rofl.

[oldmac]

the artic circle actually gets 24 hours of light between june and august! good luck growing MJ in -40C weather though rofl.

Hi syde00,

Thanks for that, I was just going explain to ImageReaper the same thing. I stayed with a friend north of Fairbanks and in the summer at a certian point the sun comes up and then just geos round and round in the sky, till weeks later it finally sets a bit. Most disconcerting to people not use to it...imposible to tell north from south while looking at the sun.

[oldmac]

:

What kind of plant did y'all grow? I'm guessing it wasn't even close to the cannabis species, with different native habits, growing conditions, nutrients and such. Galss container to monitor roots? C'mon...more info...

Although Image said it was his opinion, and you acknowledged his saying it was his opinion...I'm surprised to see you jump in with your opinion as if it were fact. This debate has raged on forever because there is ample suggestions for supporting both sides, and most of us that believe in the darkness period (me included) are, at the very least, mimicking the general conditions in nature, without risking developmental stress. (and a larger electricity bill) So without supporting documentation, your words will have be added to the 'darkness not necessary' category.

In other words...the next time you decide to slam someone else's opinion, how about showing your proof?

Too many cannabis fables...not nearly enough documentation.

Hello Rusty,

First, let me appologize to you and IR, I was hoping to start a dialogue with him over certian inaccurrate statements he has made lately and where not proceeded by a opion disclaimer. I had seen you post a similar idea for the need for sleep, with the IMO....I was happy IR did it the same.

I was not trying to "slam" his opinion, that is really hyperbole on your part.
In fact I stated I held the same opinon right up to a few years ago, till I got some facts. But you are right, I should have labled it opinon so not to offend anyone who wanted to disagree with current scienitific thinking on this subject.

So here goes. It is my opinon, based on what I've been taught in a classroom, read in a botany textbook and later proved by real world experiments that marijuana, as a C3 plant has no need for a dark period or in human terms "rest" period, while in it's in VEGATIVE state. And they will grow roots without any dark period. In fact, while growing 24/0 for 24/7 it is quite "happy" to put it in human terms again. During the FLOWERING state a dark potoperiod is necessary.

Wish I was taking pics back then to doc the experiment. But the experiment was something I did after reading some BS on these boards last year. "you can't clone using 12/12". The debate went for awhile, to me it was stupid to argue since it is so easy to do an experiment, and that's what I did. Proved, at least to myself, you could clone at 12/12 if just took twice as long, or if I gave them the same number of days in the cloner, the 12/12 group had about 1/2 the amount of root mass. The only logical conclusion I could draw was they did not grow roots during the dark photoperiods ("sleepy time" to you). Try it, let me know how it works, for you.

BTW: In the college course I took we oviously did not grow any mj (wow, willing to make safe bets) but it was an often talked about often asked about plant. And the prof devoted one whole day to it (he told me after the class it's always the same, worlds most popular weed I guess)

In the future when I state something, I'll use the opinon disclaimer, even when I know it to be fact...like C3 plants need no dark photoperiod during veg.

Soooo speaking of cannabis fables, how about some proof for your opinon that marijuana needs a "rest period"? Maybe a couple of coffee breaks during the day would suffice. And since you feel strongly about thier need to rest, what are your thoughts on giving them two weeks vaction every year?

[Rusty Trichome]

Hello Rusty,I was not trying to "slam" his opinion, that is really hyperbole on your part.
In fact I stated I held the same opinon right up to a few years ago, till I got some facts. But you are right, I should have labled it opinon so not to offend anyone who wanted to disagree with current scienitific thinking on this subject.

Hyperbole...? An obvious exaggeration...? Lol. You are slamming anyone's opinion that doesn't jive with yours. I could care less what the subject matter, if you are going to correct someone else's post, you damn well better be ready to back your words. Again...what facts? All I'm asking is for you to show some proof of your difinitive statements.

here goes. It is my opinon, based on what I've been taught in a classroom, read in a botany textbook and later proved by real world experiments that marijuana, as a C3 plant has no need for a dark period or in human terms "rest" period, while in it's in VEGATIVE state. And they will grow roots without any dark period. In fact, while growing 24/0 for 24/7 it is quite "happy" to put it in human terms again. During the FLOWERING state a dark potoperiod is necessary.

As I perviously stated, most of us believe that the rest period is helpful. Nobody said mandatory, as we all know cannabis does not need a dark period early in veg. But regardless, are you claiming that cannabis grows better (healthier, faster, stronger) on a 24/0 schedule in veg, than a 18/6 schedule? I'm not a believer, so go ahead and feel free to prove it.
In my experience, rooted clones and seedlings do better with a nightly dark period. I offer no proof, but I know what works for my cannabis plants, and share this insight with others.

In the future when I state something, I'll use the opinon disclaimer, even when I know it to be fact...like C3 plants need no dark photoperiod during veg.

Damn good idea, as your "fact" is lacking proof. Especially if in regards to improved growth habits.

Soooo speaking of cannabis fables, how about some proof for your opinon that marijuana needs a "rest period"?

My proof...? There is none, which is why the debate continues unresolved.
Your last statements are childish at best. :thumbsup:

[purplekush989]

who has a bigger dick, rusty trichome or oldmac?