Forcing bloom: Manipulating photoperiod for out of season harvest - Page 6 - Growing in Greenhouses - International Cannagraphic Magazine Forums

Dr.Young · 10-25-2014, 03:56 AM

Wow dude... That is perfect... I was trying to think of a little setup that I could build, and maybe slide the plants into a black-box at night, but thats even better. I could just slide the roof instead of the plants

SOG ftw

IntelliGeneS · 12-11-2014, 08:34 PM

Good collection of info, thanks.

BuhBeeLawnFall · 05-20-2015, 11:08 PM

My guys run light dep greenhouses.
Like very large versions of daviduski's contraption.

02-02-2017, 03:16 PM

https://youtu.be/DtzGmZEqPQU

02-02-2017, 03:20 PM

This is what I would use. Works going downhill as well. I've seen tarps 53' long and I'm pretty sure they'd make you a bigger one if you asked. Only 8' wide as built but it should scale up.

Rowerg · 12-10-2018, 01:23 PM

What a sight for sore eyes!

hos · 05-03-2019, 12:51 PM

Hi. I am starting to grow some sativa dominant plans in my friends greenhouse. I would like to start them flower in the begining of August. I am thinking to cover them to full dark for 3 or 4 days to start them flower. Feed them with pk 13-14 for support.
Does anybody know whats gonna happen if i uncovered them and the sunlight is still more than 14 hours in a day?
Thanks.

CowboyTed · 07-30-2019, 03:36 AM

Quote:

Originally Posted by hos

Hi. I am starting to grow some sativa dominant plans in my friends greenhouse. I would like to start them flower in the begining of August. I am thinking to cover them to full dark for 3 or 4 days to start them flower. Feed them with pk 13-14 for support.
Does anybody know whats gonna happen if i uncovered them and the sunlight is still more than 14 hours in a day?
Thanks.

I don't know from personal experience, but I've read that some strains can sense that the nights are getting longer each day, and so they stay in flower, even though removing the blackout mechanism means that the plants are exposed to longer days.

I'm at the point where I have two plants in flower now, and I'm wondering when I can stop covering them, and just let the natural daylight take over.

Thankfully, I can go on black-boxing the plants as long as I need to, but I too wonder whether it is necessary.

grayeyes · 08-01-2019, 03:21 AM

Ok, the OP asked about forced flower not greenhouses.

I have done my last three grows this way. I start seed in cups then when 10-12 inches I transplant to 1 gallon pots. The 1 gallon pots, once they have at least 5-6 nodes then are moved for a 12/12 cycle into my bathroom with towels covering the window. After 6-8 days I can see what sex the plants are going to be. You can re-veg but I never do.

After that your plants follow the flowering cycle that your seed seller told you or you do the waiting game like everybody else.

Oh, I live in CA and grow outside. No giant electric bills that way. I feel sorry for indoor growers.

10-25-2014, 03:56 AM	#51
Dr.Young Lvl 1 Peasant Join Date: Oct 2010 Posts: 2,240	Wow dude... That is perfect... I was trying to think of a little setup that I could build, and maybe slide the plants into a black-box at night, but thats even better. I could just slide the roof instead of the plants SOG ftw __________________
	Quote

08-01-2019, 03:21 AM	#59
grayeyes Member Join Date: Jan 2019 Posts: 385	Ok, the OP asked about forced flower not greenhouses. I have done my last three grows this way. I start seed in cups then when 10-12 inches I transplant to 1 gallon pots. The 1 gallon pots, once they have at least 5-6 nodes then are moved for a 12/12 cycle into my bathroom with towels covering the window. After 6-8 days I can see what sex the plants are going to be. You can re-veg but I never do. After that your plants follow the flowering cycle that your seed seller told you or you do the waiting game like everybody else. Oh, I live in CA and grow outside. No giant electric bills that way. I feel sorry for indoor growers.
	Quote 2 members found this post helpful.

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12-11-2014, 08:34 PM	#52
IntelliGeneS Member Join Date: Jun 2014 Posts: 90	Good collection of info, thanks.
	Quote

05-20-2015, 11:08 PM	#53
BuhBeeLawnFall Member Join Date: May 2015 Location: Between 'realism' and 'idealism'. Posts: 159	My guys run light dep greenhouses. Like very large versions of daviduski's contraption.
	Quote

02-02-2017, 03:16 PM	#54
trichy1 Guest Posts: n/a	https://youtu.be/DtzGmZEqPQU
	Quote

02-02-2017, 03:20 PM	#55
trichy1 Guest Posts: n/a	This is what I would use. Works going downhill as well. I've seen tarps 53' long and I'm pretty sure they'd make you a bigger one if you asked. Only 8' wide as built but it should scale up.
	Quote

12-10-2018, 01:23 PM	#56
Rowerg Newbie Join Date: Apr 2017 Location: North York, ON Posts: 41	What a sight for sore eyes!
	Quote

05-03-2019, 12:51 PM	#57
hos Newbie Join Date: May 2016 Location: Czech Rep. Posts: 4	Hi. I am starting to grow some sativa dominant plans in my friends greenhouse. I would like to start them flower in the begining of August. I am thinking to cover them to full dark for 3 or 4 days to start them flower. Feed them with pk 13-14 for support. Does anybody know whats gonna happen if i uncovered them and the sunlight is still more than 14 hours in a day? Thanks.
	Quote