Friend accidently set timer to 13/11 instead of 12/12 any harm done?

[GreenyGreen]

Well the question is as the title, he has 6 clones on week 5 of flowering and just realized that his timer was set to 13 on and 11 off. He also is noticing that some of the hairs on lower buds are starting to shrivel and turn a brownish color. I will put up a pic as soon as he gets me one but what effect if any could the time problem have on his harvest/plants. Could the light have somehow shortened their flowering time? More hairs have changed than he is used to with this strain, something he has grown 4-5 times. He is using his ferts at 3/4 strength just in case it is fert burn. Thanks.

 

[Capt.Ahab]

I would just put them on 12/12 .It shouldnt bother the plants too much, if a all.
What do the main colas look like? If they are still going strong I think all will be fine if you switch them to 12/12

 

[GreenyGreen]

From what I understand from his description the main colas are still fine and not showing any signs of finishing up. I figured too that if this far into flowering they have all stayed female and continued to develop appropriately that the light difference could not have stressed them that much. But yeah for the rest of the period it will be correct at 12/12.

 

[Lofty]

there'll b no probs there gg, i used to do my whole grow on 13/11, but many times wen i've needed to work in my roo'm i've altered the lites by a hour and not noticed any dif.

good luck

 

[Guest]

Lofty he means 13 light 11 dark unless I misunderstood,it takes 12 hours of dark time in a 24 hour period to get a plant to flower so I dont think you fklowered your whole grow at 13/11.I think you mean 11/13 right?Just dont want newer growers to become cornfused.GG one day of 11 hours dark isnt going to harm them,premature turning of pistils can mean pollenation though he should check thoroughly for male parts,I doubt it though if its a 5th "generation" clone

 

[GreenyGreen]

Hey Ballastman and Lofty. Ballastman you are correct, 13 hours light, 11 hours dark. However all plants have started flowering under this light cycle, they are 5 weeks into flowering and 5 weeks of being on 13 on/11 off but they ae just starting to fatten up the buds. No hermaphrodite signs yet but we did change it to 12/12 yesterday. I will tell my friend to do a more thorough investigation for male parts, his last grow with this strain went herm on him but we are confident there was a light leak last grow and these are not clones of the plants that went herm.

 

[mtnjohn]

the plants will flower fine

in my experience 13/11 works great ..more light equaling more bud
but they always seemed to take a little longer too

so it's all relative..i guess
mj


i should mention that my last 3 or 4 grows were 13/11 on off
my current grow is back to 12/12...
and the plants are indeed maturing a little quicker

 

[Lofty]

Lofty he means 13 light 11 dark unless I misunderstood,it takes 12 hours of dark time in a 24 hour period to get a plant to flower so I dont think you fklowered your whole grow at 13/11.I think you mean 11/13 right?Just dont want newer growers to become cornfused.

ye i was bamboozeled there, i've never eard of that, thanx ballestman, peace.


mtnjohn has got it nailed, the grow will b fine it'll just take a bit longer, i reckon a week.

 

[thedarkknight]

if they've manage to flower with 11 hours dark, then they should continue to do so... but its probably best to switch them to 12/12. Your grow should be fine but it will take a few days longer.

 

[wantaknow]

same here 13 on 11 off ishow i run

 

[Bermyboy]

12/12 is not necessary for flowering LOFTY you could probably get many strains to flower at 13/11, or even 14/10

 

[Guest]

I agree totally with bermyboy....

many strains will flower with more than 12 hours light....

or no plants would flower outdoors in the northern united states....

outside according to my sunrise sunset table my first day of 12-12 occurs in the last week of september....

we get frost on average by the 2nd week of october.....

I think 12-12 is commonly used because it will flower ALL plants both indica and sativa....

this ideas that 12 hours dark is the only thing that works is probably the funniest bit of misinformation many growers hang on to....

another example... Ive seen guys shortening their daily cycles to 18 hours or so....

using 6 light and 12 dark....


lol....no way you need 12 hours of dark if you are using only 6 hours of light.....

 

[Guest]

Damn the very first time I grew inside before I discovered the forums on the advice of a supposed former grower,I vegged at 14 light 10 dark and flowered at 14 dark 10 light.I dont see how a plant could possibly flower under 14/10 or even 13/11 for that matter.I guess it can if you say you do it that way but unless we have a miscommunication breakdown,I have to disagree.We probably have a miscommunication and its probaly due to my blockheaded head fred.

 

[Guest]

I can only tell you what happens outside.....

I mention the sunrise sunset tables for my area....

Keeping in mind this doesnt mean dark to dark....

prior to sunrise and after sunset it takes about 45 minutes until dark.....

so even in late september the plants when the tables say 12-12 is actually at least

12.5 light 11.5 dark...

My assumption would be you have never grown outside......

 

[Guest]

Here is a recent post by rosy that talks about 13-11

I agree and disagree with some of the inputs in this thread. First of all, cutting down on the light hours is hardly ever a good idea.
In 1973, two researchers (Valio and Valle) tested the influence on cannabionid content in Cannabis Sativa with different light cycles.
In short, they came to the conclusion that the longer the uninterrupted light cycle was, the higher the cannabinoid (THC) content in the plants.
In fact, between plants grown under 10 hours of light and 12 hours of light, the cannabionid content was twice (!) as high in the 12/12 test group. The researchers concluded that Cannabis needs 12/12 or 13/11 of uninterrupted light in order to reach maximum cannabinoid content. Here's an abstract of their research, the entire study can also be downloaded on the same site (UN office of Drugs and Crime):
http://www.unodc.org/unodc/bulletin/bulletin_1978-01-01_1_page008.html

If you want to cut down light hours on a strain to finish it faster (or force finish a stubborn sativa that refuses to mature), know that when you rush things, you always loose out on quality and quantity. The plant produces flowers and resin up until late flower stage. Therefore, light cycles should never be shortened before peak flower stage, and preferably only in the very last week of the grow.

After reading the study....

of interest they said they used 14 and 16 hour light cycles as well....

They observed that at 14 and 16 hours no flowers formed.....

But I should mention this study was done in Brazil....

I suspect with sativas only....

I also think if they tried some indicas they would have flowered at 14 hours light....

 

[Guest]

I live in Fla where the longest day june 20th I think it is is about 13 light 11 dark,So obviously plants will veg with 13 hours light,They probably would inside too even indica's I know for sure at 14 hours light they will veg inside

 

[Guest]

Man you southerners sure are hard headed.....

Ive seen plants flower under 14 hours light....

Tampa has a longest day about 14 hours....


Here is an ask ed....



Marijuana's growth stage is determined by the number of hours of uninterrupted darkness it receives rather than its chronological age. When it receives 18 hours of light or more daily it grows vegetatively, producing more branches and leaves. When subjected to an uninterrupted dark period of 12 hours daily, its growth switches from vegetative to reproductive and it begins to flower. There is no reason to make this switch gradually. The plants respond rather mechanistically to the light regimen.

Outdoor cultivated marijuana flowering is also determined by the number of hours of uninterrupted darkness it receives. During the summer, when the day length is longer nearer the poles than the equator, a particular marijuana variety flowers much earlier in Florida than in Vancouver. It begins to flower when a critical dark period is reached. For most varieties this seems to be between 8 and 12 hours of uninterrupted darkness daily.

You can find out a plant's critical light level by observing plants outdoors to see when they start flowering. Check the length of the darkness period when you observe the first flowers. Indoors, you can start at 9 hours of darkness and increase the dark period by 15 minutes each week. Figure the critical period as 15 minutes shorter than the dark period length when you see the first flowers. Suppose a plant's critical dark period is 10 hours. This means that it will flower under 14 hours of light per day. This is 2 hours longer than the 12 hour light period which is generally recommended. The two hours extra light each day is a 16 percent increase in light to the plant. This is critical because light = growth.

A shorter dark period may lengthen the flowering period a bit. To get the buds to ripen quickly, the dark period can be lengthened to 12 or even 14 hours.
=====================================
Here is a second....

I don't see how the light cycle during the vegetative stage would affect the plants when they are flowering. The long light cycle just gets the plants to the size for forcing flowering more quickly. Trying to grow many of the commercial varieties under 14 hours of light, 10 hours of darkness during the vegetative cycle would result in the plants being triggered to flower.

 

[Dr Dog]

All this arguing over a hour? Dude if they are at 5 weeks flower, you should start to see the hairs turning. Just flip them to 12/12 no harm no foul. As I get to the end of my grow cycles i constantly reduce the light cycle until I get to the desired 24 hours of darkness b4 harvest.

 

[Guest]

You miss the point....

its not about an hour....

Its about how it works.....

 

[Guest]

Hey I'm not arguing,just stating something from experience on INDOOR growing I thought thats what this was about anyway.I've vegged plants indoor on a 14 light 10 dark cycle and flowerewd them exactly the opposite.Ed says when it receives 18 hours or MORE it will grow vegetatively,my experience tells me this guy is full of it.I veg at 18/6,16/8 15/9 and anything in between,it certainly doesnt deed 18 or more hours thats fuckin ridiculous.I dont know how this thread got to talking about outdoors anyway,things are different growing indoors and I know for a fact you arent getting any plants to flower indoors with only 10 hours of dark and 14 of light,probably not 11 hours of dark and 13 of light for that matter.Ed himself says it needs 12 hours of uninyerrupted dark in a 24 hour perioed to flower a plant indoors.This is the indoor forum ya know lol.I want someone to show me how to flower a plant indoors under a 14/10 or 13/11 light cycle,its not going to happen