Greenhouse Dark Period

[TanzanianMagic]

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]

i just used a black tarp

 

[TanzanianMagic]

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.

 

[guest4098]

Tanzanian I am wondering the same thing. There is of course http://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]

Take a look here, there are a few pics of how we do it--
http://www.icmag.com/ic/showthread.php?t=178422