starting seeds under 12/12 with intention to veg - Cannabis Botany and Advanced Growing Science - International Cannagraphic Magazine Forums

mad librettist · 01-12-2012, 04:58 PM

Heya gang, I have a botany question.

I am experimenting with starting seeds under 12/12 with the intention of increasing day length thereafter and veging for some time under 18/6.

How long can I have a seedling under 12/12 without triggering flowering?

dizzlekush · 01-12-2012, 05:30 PM

In a Cervantes book he suggests 14/10 until the first pair of non cotyledon leaves are developed to increase the amount of seeds that develop female. He claims that he got this advice from a seed breeder. Cant remember which one

Im fairly certain Ethephon, 6-BAP or possibly even negative temperature differentiation for dark periods would be just as likely to increase female %. I can cite literature if this is the goal of your experiment.

VerdantGreen · 01-12-2012, 05:36 PM

mad, i've done a similar thing and if you go back to 18/6 or whatever as soon as they show sex then they seem to carry on vegging just fine. if you kept them on 12/12 for much longer than that then you would probably get into a revegging situation and the associated growth check.

Duplicate · 01-12-2012, 06:36 PM

Interesting idea! (tagged)

Chimera · 01-13-2012, 03:04 AM

Quote:

Originally Posted by dizzlekush

In a Cervantes book he suggests 14/10 until the first pair of non cotyledon leaves are developed to increase the amount of seeds that develop female. He claims that he got this advice from a breeder, 'Chimera' from Chimera Seeds if memory serves. No idea if any relation to Chimera, the member here on IC

Im fairly certain Ethephon, 6-BAP or possibly even negative temperature differentiation for dark periods would be just as likely to increase female %. I can cite literature if this is the goal of your experiment.

>> I didn't give that advice to Jorge. I am however editing and co-authoring the newest book and that piece of info will not make the next edition, fwiw.

Gender is determined at fertilization... you can alter the sexual expression of a seed's gender via applications of ethephon (or sts) etc but the effect transient on only temporary.

-Chimera

motaloca · 01-13-2012, 05:07 AM

i am at n13 lat, so i have 12 12 minus, plus 1, 2 hours all year round.i start outside and put them under 18/6 when they show sex(depends on strain but generally around 20 days from breaking soil). so far i haven't had any problems(if i put them under 18/6 at first sign of sex).

I found when i put them back under 12 12 they will start flowering faster, than plants who spent all their lives under 18/6.

mad librettist · 01-14-2012, 02:17 PM

Thanks guys, very informative.

My goals are as follows:

Maintaining fertility by keeping plants in there at all times
shortening the time required in my veg tent
make use of empty spots in the flower tent (perpetual)

My veg space is only half as big as my flower space, so if I can make use of all spots at all times that is reducing the bottle neck.

Ground Up · 01-14-2012, 05:01 PM

Hey chimera , ... You have been around the genetic BUSH for awhile .!!! What would say is best genetic?strain structure for indoor and outdoor!! By the way love your work............... no homo !! LOL

supermanlives · 01-15-2012, 12:45 AM

Quote:

Originally Posted by VerdantGreen

mad, i've done a similar thing and if you go back to 18/6 or whatever as soon as they show sex then they seem to carry on vegging just fine. if you kept them on 12/12 for much longer than that then you would probably get into a revegging situation and the associated growth check.

wow i am gonna try it on some extra seeds. c4 sucked. aurora was fine along with everything else. tom and chimera you guys rock . keep up the good work . stay safe guys. you are a constant source of valuable information and genetics. big props for all you do

Phaeton · 02-28-2012, 11:50 PM

This all sounds suspiciously like the 12/1 clone/veg I use, but I don't have to swap to 18/6 as the plant will not go to full flower.
Yes, the buds show up days sooner when put to 12/12, with less stretch involved. Internode spacing is controlled by spectrum and intensity during the veg cycle.
All in all, when set up correctly it is win win win with shorter light periods.
"correctly" is proven to vary quite a bit, I cannot grow both sativa and indica correctly in the same room. Requirements are not close enough. I chose sativa, yum yum.

01-12-2012, 04:58 PM	#1
mad librettist Banned Join Date: Jan 2010 Posts: 5,120	starting seeds under 12/12 with intention to veg Heya gang, I have a botany question. I am experimenting with starting seeds under 12/12 with the intention of increasing day length thereafter and veging for some time under 18/6. How long can I have a seedling under 12/12 without triggering flowering?
	Quote

01-12-2012, 05:30 PM	#2
dizzlekush Member Join Date: Jul 2011 Posts: 458	In a Cervantes book he suggests 14/10 until the first pair of non cotyledon leaves are developed to increase the amount of seeds that develop female. He claims that he got this advice from a seed breeder. Cant remember which one Im fairly certain Ethephon, 6-BAP or possibly even negative temperature differentiation for dark periods would be just as likely to increase female %. I can cite literature if this is the goal of your experiment. __________________ "Believing that your hypothesis must be correct before all the evidence is gathered encourages you to interpret the evidence selectively. This is human nature. It is also precisely what the scientific method tries to avoid. It does so by requiring that scientists not just test their hypotheses, but try to prove them false." - Gary Taubes "You can't convince a believer of anything; for their belief is not based on evidence, it's based on a deep seated need to believe." - Carl Sagan "The more I learn, the more I realize how little I know." - Attributed to Socrates
	Quote 1 members found this post helpful.

01-13-2012, 05:07 AM	#6
motaloca Gardening with The Moon Join Date: Feb 2008 Location: Where the wild things grow Posts: 899	i am at n13 lat, so i have 12 12 minus, plus 1, 2 hours all year round.i start outside and put them under 18/6 when they show sex(depends on strain but generally around 20 days from breaking soil). so far i haven't had any problems(if i put them under 18/6 at first sign of sex). I found when i put them back under 12 12 they will start flowering faster, than plants who spent all their lives under 18/6. __________________ I don't do drugs, I smoke weed.
	Quote 2 members found this post helpful.

01-14-2012, 05:01 PM	#8
Ground Up Member Join Date: Nov 2011 Posts: 358	Hey chimera , ... You have been around the genetic BUSH for awhile .!!! What would say is best genetic?strain structure for indoor and outdoor!! By the way love your work............... no homo !! LOL __________________ Ground Up ... Its how good things Grow!! You can wish in one hand and crap in the other. See which one fills up first -- Life
	Quote

01-12-2012, 06:36 PM	#4
Duplicate Member Join Date: Jun 2011 Posts: 561	Interesting idea! (tagged)
	Quote

01-14-2012, 02:17 PM	#7
mad librettist Banned Join Date: Jan 2010 Posts: 5,120	Thanks guys, very informative. My goals are as follows: Maintaining fertility by keeping plants in there at all times shortening the time required in my veg tent make use of empty spots in the flower tent (perpetual) My veg space is only half as big as my flower space, so if I can make use of all spots at all times that is reducing the bottle neck.
	Quote

02-28-2012, 11:50 PM	#10
Phaeton Speed of Dark Join Date: Apr 2011 Location: Interior Alaska Posts: 1,554	This all sounds suspiciously like the 12/1 clone/veg I use, but I don't have to swap to 18/6 as the plant will not go to full flower. Yes, the buds show up days sooner when put to 12/12, with less stretch involved. Internode spacing is controlled by spectrum and intensity during the veg cycle. All in all, when set up correctly it is win win win with shorter light periods. "correctly" is proven to vary quite a bit, I cannot grow both sativa and indica correctly in the same room. Requirements are not close enough. I chose sativa, yum yum.
	Quote