Flowering light switch.
- Thread starter jpl4712
- Start date
GimpDoctor420
Active Member
they should be fine from doing it. if your worried or if your plants are susceptible to stressw, you could always do it an hour a day off each day for 12 days... but thats just stressfull.
GimpDoctor420
Active Member
not stressful on the plants i mean on you 
leave it off for 24 hours not the reverse.
Smucker G
Active Member
Why would you recommend off 24 not on? Not saying your wrong just curious. I went the other way and it was ok.
DrFever
New Member
I am guessing that if u left lights on for 24 hrs plant may go back to veg stage i would agree leave it off for 24 hrs
GimpDoctor420
Active Member
agreed. if you went the other way it prob hasnt done much bad but leaving it off would be the better approach
it's the length of daylight that the plant measures to trigger hormones not the length of darkness.
One incidence of disruption won't make a difference unless it's a very unstable strain.
GimpDoctor420
Active Member
i would say thats highly debatable because i cant think of a logical way of proving either that it measures by length of dark period or that it measures length of daylight
Brick Top
New Member
In Robbert A. Nelson's book "Hemp Husbandry" it says length of periods of light, not length of periods of darkness, determines when cannabis plants release flowering hormones to begin flowering.
Evidently the question of length of daylight or darkness triggering flowering is only open for debate among those who do not already know the answer to the question.
To help explain that, cannabis plants are photoperiod plants, the length of the photoperiod is what triggers flowering. A photoperiod is the amount of time plants are exposed to daylight, the period of time plants receive light ... not darkness.
GimpDoctor420
Active Member
well i like that someone at least has reasonable referance, but does it mention how he found that out or is he assuming like any of us can? because you cant just trust Robbert A. Nelson just because he wrote a book.
im not saying he's undoubtably wrong, but rather that it dosent quite rule out that it could be the dark period.
maybe a way to find out for sure would be to take a reasonably sized set of plants that are easily stressed - not hardy at all. and give them all perfect conditions for growing. split them up into two groups and imply a scenario like the one in this thread - that their light cycle needs to be reversed.
give one group 24hrs dark period and the other 24hrs daylight and see which group has the most plant going into flowering or shows most stress by going hermie.
who knows? maybe its a combination of the both? or either?
Brick Top
New Member
That is not the only place I have read the explanation of what triggers flowering in cannabis plants. It was just the first one to come to mind. Also the same triggering mechanism is in most flowering and fruit producing plants and bushes and trees. It is not something unique to cannabis plants and for many, many decades botanists have performed scientific experiments and have determined what triggers flowering in photoperiod plants ... and cannabis is exactly the same.
Did you happen to notice the definition of photoperiod? A photoperiod is the length of time that plants are exposed to light, not length of time plants are exposed to darkness, and cannabis is known to be a photoperiod plant, a plant where the length of the photoperiod, the length of light, will either keep it in a vegetative growth phase or trigger flowering hormones to begin the flowering stage of growth.
For some reason many people like or want or need to believe that cannabis plants are totally unique and that no scientifically proven facts that apply to most if not all other plants equally apply to cannabis plants. That is why so many people fall for so many fads and myths and urban legends and old hippie folklore about how to grow cannabis and what it needs. If more people had factual knowledge to rely on their results would be far, far better than they are.
As I said, the debate of is it length of light or length of darkness that triggers flowering is only open to debate among those who do not already know the answer to the question.
In 1880 Schubeler observed photoperiodism in 1885 Kjellman observed pohtoperiodism and in 1895 Bonnier observed photoperiodism. None knew if it was the period of light or dark that caused the trigger but that many years ago people were wondering about and thinking about and researching what is now being questioned by people in this thread with the very same questions.
By the early 1920' the actual mechanism was discovered and it has been researched many times by many people over the decades and to date the original findings have never been disproved.
Facts are facts and facts will remain facts no matter how many times people go back to thinking and wondering exactly like early researchers did way, way, way back in 1880 and 1885 and 1895.
GimpDoctor420
Active Member
as i said before i might want to make it clear, im not saying that anyone is wrong here. it has to be either that its by the length of daylight or by length of darkness so im not disregarding either.
you seem to know your stuff, specifically about photoperiodism even, so im not gonna pop out and say your wrong.
i was just saying all you've done is quote people who have stated that it is the length of daylight - i can give any number of people who might believe in the same thing, but it dosent make it true.
im not saying that Schubeler, Kjellman or Bonnier are wrong, but rather that i wasn't interested in getting the answer but more interested in finding out how these answers were developed, and i was wondering if in these books it mentions how they found out?
And quoting more names of people who have studied botany and photoperiodism isn't going inform anyone on how that conclusion was reached..
cowboylogic
Well-Known Member
Gimp a simple experiment you can do for yourself is this. 12on/8off. The dark period is comparable to the lenght of a mid-summer night. The plant will still flower. Now put a plant on a 18/18 light cycle. It will veg away possibly flowering once it is very mature. Equal periods of light/dark the same as 12/12 but you do not force it to flower. See where this is leading us? There are many ways to show a plant is reacting to the light period and not the dark period.
GimpDoctor420
Active Member
well that really is: cow-boy-logic!
i honestly crack myself up sometimes...
i honestly crack myself up sometimes...
cowboylogic
Well-Known Member
Hey whatever it takes to figure something out. LOLwell that really is: cow-boy-logic!
i honestly crack myself up sometimes...
jawbrodt
Well-Known Member
^Exactly. Being that reducing the photoperiod to around 12 hours per day, is what triggers flowering, and that increasing the photoperiod will cause plants to go back into the vegetative state,.... I don't see what the arguement is. Common sense should tell you that it'd be less stressful to give them 24 hours of darkness, than giving them 24 hours of light. Of course, a gradual shift, would be optimum, but unnecessary, if you're an impatient person, such as myself.lol
Also, not that I don't appreciate the evidence/info provided in this thread. I was just stating the obvious, and perhaps, stirring things up, just a little.
Also, not that I don't appreciate the evidence/info provided in this thread. I was just stating the obvious, and perhaps, stirring things up, just a little.
GimpDoctor420
Active Member
haha no not stirring things up^Exactly. Being that reducing the photoperiod to around 12 hours per day, is what triggers flowering, and that increasing the photoperiod will cause plants to go back into the vegetative state,.... I don't see what the arguement is. Common sense should tell you that it'd be less stressful to give them 24 hours of darkness, than giving them 24 hours of light. Of course, a gradual shift, would be optimum, but unnecessary, if your an impatient person, such as myself.lol
Also, not that I don't appreciate the evidence/info provided in this thread. I was just stating the obvious, and perhaps, stirring things up, just a little.
i didnt mean for anything to come across as an arguement
most people would have thought that its the dark period that triggers it because when your in veg switching, most people arrange it so that they just lose 6-8 hrs of light and well... it really is sort of a glass half full/half empty sorta thing really in terms of obviousness.
and BrickTop i never meant to deny anything you've said - if thats the way it came across.