18 hour light during end of flowering

I'm thinking about turning lights back to 18 hour light during the last 2-3 weeks of flowering because half my room is indica which are done, and half are sativa which need a few more weeks. Has anyone done this and still had there plants finish maturing or at least be able to put on that end of flowering weight gain? I've revegged before after a plant was in the middle of flowering, and it took about 2-3 weeks before I saw it putting out new green growth, and that was under 24 hour light.

oyvaydude said:

I'm thinking about turning lights back to 18 hour light during the last 2-3 weeks of flowering because half my room is indica which are done, and half are sativa which need a few more weeks. Has anyone done this and still had there plants finish maturing or at least be able to put on that end of flowering weight gain? I've revegged before after a plant was in the middle of flowering, and it took about 2-3 weeks before I saw it putting out new green growth, and that was under 24 hour light.

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I say do it, if it fucks everything up better u than me

Stupid to do as it would send them back into veg. You can reduce the amount of light to 10 hrs and 14 darkness to help the sativas ripen.
Remember 12 or more hours of uninterrupted darkness is what you want in flower.
Just incase anyone ever has an accident with giving light during a dark period you should immediatly give them 12 hrs darkness to avoid hermies. No matter where you are in the flower cycle the dark period is the most important.

sounds like hearsay, I dont see anyone thats actually tried it. It takes time to revert or go into flowering, As everyone knows, changing a plants light cycle from veg to 12-12, the plant still takes at least a week to begin flowering, until those flowers come, the growth that began, continues to mature. Based on that, I believe that although new flower calyx will stop being produced a few days after going back to 18/6, I think whatever calyxes exist, will continue to swell and mature. It just makes sense..

On another note though, has anyone successfully reduced flowering times by reducing the light to 10 hours darkness? If so by how much?

Your indicas will begin to foxtail and trichromes maturation will halt.

I placed 2 girls outside towards the end of flower.

In the end, it made a bigger harvest but fluffier buds that's weren't as potent as they could have been had they just finished.

oyvaydude said:

sounds like hearsay, I dont see anyone thats actually tried it. It takes time to revert or go into flowering, As everyone knows, changing a plants light cycle from veg to 12-12, the plant still takes at least a week to begin flowering, until those flowers come, the growth that began, continues to mature. Based on that, I believe that although new flower calyx will stop being produced a few days after going back to 18/6, I think whatever calyxes exist, will continue to swell and mature. It just makes sense..

On another note though, has anyone successfully reduced flowering times by reducing the light to 10 hours darkness? If so by how much?

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I have tried it many times to send a plant back into veg so it can be saved. It takes about 4 weeks for new growth in veg. As Ulen says the plant stops growing and doesn't know what to do for 2-3 weeks because the hormone s are out of wack.
Just because you haven't seen it, does not make it not true, and the same with this statement, "Based on that, I believe" is not a statement based on observed results. The thc matures the last few weeks of flower otherwise the weed will be picked to early and probably not get you high. If forced back into an 18/6 phase the chemical hormones that allow for the weed to be psycoactive fade and it will not be very potent.
The last statement about reducing the light to 10 hrs darkness is wrong. You want to increase the dark period (10 lights on /14 dark) to help late flower sativs finish a little sooner. It forces the flower hormone to increase, signaling the plant to finish because the season is ending. UVB exposure helps trich heads to amber sooner and are results I can personally say I have seen. Helps finish about a week sooner.

Isnt that how the make feminized seeds?

oyvaydude said:

I'm thinking about turning lights back to 18 hour light during the last 2-3 weeks of flowering because half my room is indica which are done, and half are sativa which need a few more weeks. Has anyone done this and still had there plants finish maturing or at least be able to put on that end of flowering weight gain? I've revegged before after a plant was in the middle of flowering, and it took about 2-3 weeks before I saw it putting out new green growth, and that was under 24 hour light.

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joespit said:

Isnt that how the make feminized seeds?

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No. There was a way in very late flower to force them to produce male flowers but it doesn't work with all strains. Think DR green thumb and Soma do it like that but most use Csilver or another chem to induce.

oyvaydude said:

I'm thinking about turning lights back to 18 hour light during the last 2-3 weeks of flowering because half my room is indica which are done, and half are sativa which need a few more weeks. Has anyone done this and still had there plants finish maturing or at least be able to put on that end of flowering weight gain? I've revegged before after a plant was in the middle of flowering, and it took about 2-3 weeks before I saw it putting out new green growth, and that was under 24 hour light.

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DO NOT SO THIS, YOU WILL GET HERMIES OR THEY WILL REVEG, BOTH ARE TERRIBLE. tAKE THE VEGGIES OUT OF THE FLOWERING ROOM AND PUT THEM UNDER ANY FLORECENT LAMP FOR A FEW HOURS ON TOP OF THE 12 AND THEY WONT FLOWER.

This is a bad idea.

Don't change the light cycle to veg, due to the possibility of the plant reverting to hermy. Instead I would add a micro-bloom nutrient in slightly higher dosages to boost resin production. then flush the last week.

ive done 12-12.. 11-13... 10-14.. 13-11.. WITH NO ISSUES.. IN FLOWER.. BUT NEVER TRIED ANYTHING MORE THEN THAT..

what were your experiences with those different on/off times. Quality, bud density, flowering time, yield?

Do it, and report your findings with lots of pics.

Doubt it's a good idea though.

Just incase anyone decides to reveg a keeper after flower, repotting to a bigger container does help rejuvenate the veg growth faster. But give it a few weeks first to recover, if it can, and leave as many leaves and branches on as possible along with a little bud growth. 24 hrs light helped on the ones i've done.

I have given plants 10hrs of.dark and the buds did ripen much quicker. I norm do this last.week when flushing and raise the lights wen on.....

The longer the dark period the quicker they flower, but a quicker flower means less time making buds so less yield...

Does no one read ?? R c clarke covered this....

Pepe le skunk said:

Stupid to do as it would send them back into veg. You can reduce the amount of light to 10 hrs and 14 darkness to help the sativas ripen.
Remember 12 or more hours of uninterrupted darkness is what you want in flower.
Just incase anyone ever has an accident with giving light during a dark period you should immediatly give them 12 hrs darkness to avoid hermies. No matter where you are in the flower cycle the dark period is the most important.

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So ,, question,, what do you think about a 12 hour dark, 24 hour light (36 hour day)

Question fellas!?
Today lights stayed on an hour extra on accident, by he time I got to them they had turned off at 8:00pm, my schedule is 7pm off 7am on, I run two sides against both walls, on one side is LED other HPS, the led has a weird built in timer that saved 8:00pm the HID side is on timers so they turned off anyways i didn't want to open the door and get more light in after they had already been off for 10 mins or so to change the timers to 8am. Should I have changed @8am instead of 7am, so they get a full 12 hour of darkness? Now they are on schedule to turn on tomorrow morning 7am they are two weeks into flowering with flowers showing. Should I have changed it to turn on @ 8am anyways? Hopefully they don't hermie on me... any thoughts anyone??

Imaperson30 said:

So ,, question,, what do you think about a 12 hour dark, 24 hour light (36 hour day)

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I've done some light cycles like that without hermy problems. I would say it made things take longer, not go faster, but I didn't do any proper testing.