Greenhouse Dark Period - Growing in Greenhouses - International Cannagraphic Magazine Forums

TanzanianMagic · 08-18-2010, 07:26 AM

What are the main ways to manipulate the photo period in a greenhouse? I've been looking for this information for a long time, but I can't find much on it.

Chrysanthemums also need a shortening daylight period to flower, but I haven't been able to find much beyond that.

surfguy1936 · 08-18-2010, 09:26 AM

i just used a black tarp

TanzanianMagic · 08-19-2010, 05:16 AM

Quote:

Originally Posted by surfguy1936

i just used a black tarp

What is the size of the greenhouse? Did you just pull it over whatever you're using, is it mechanized?

I wonder how they darken those large greenhouses.

10-07-2010, 08:37 AM

Tanzanian I am wondering the same thing. There is of course https://www.foreverflowering.net/ who seem to have recently updated their website. I would love to learn about others or any useful systems for constructing one. Check out some of the hurricane shutter companies, and the ones that make automatic curtains/drapes. Lots of options but I haven't seen any that are designed for light dep out of the box except Forever Flowering.

kmk420kali · 10-07-2010, 06:37 PM

Take a look here, there are a few pics of how we do it--

https://www.icmag.com/ic/showthread.php?t=178422

08-18-2010, 07:26 AM	#1
TanzanianMagic Member Join Date: Nov 2006 Posts: 559	Greenhouse Dark Period What are the main ways to manipulate the photo period in a greenhouse? I've been looking for this information for a long time, but I can't find much on it. Chrysanthemums also need a shortening daylight period to flower, but I haven't been able to find much beyond that.
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10-07-2010, 06:37 PM	#5
kmk420kali Freedom Fighter Join Date: Mar 2006 Location: So Cal Posts: 5,852	Take a look here, there are a few pics of how we do it-- https://www.icmag.com/ic/showthread.php?t=178422 __________________ With Red-Eyed Respect--Jim My GH at the pad-- https://www.icmag.com/ic/showthread....=1#post4996785
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08-18-2010, 09:26 AM	#2
surfguy1936 Newbie Join Date: Feb 2009 Posts: 32	i just used a black tarp
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10-07-2010, 08:37 AM	#4
guest4098 Guest Posts: n/a	Tanzanian I am wondering the same thing. There is of course https://www.foreverflowering.net/ who seem to have recently updated their website. I would love to learn about others or any useful systems for constructing one. Check out some of the hurricane shutter companies, and the ones that make automatic curtains/drapes. Lots of options but I haven't seen any that are designed for light dep out of the box except Forever Flowering.
	Quote