OK good morning everyone,

Last night i was just reading on the internet bout flowering cycles outside for marijuana. I read an article that said if you cover your plants outside with a black heavy duty thrash bag where no light can get in you can acctualy start to alter the flowering cycle, seems plausible.

Question i have is if you put a bag over a plant like that is there risk of any kind of suffication i guess you would call it. Like no fresh air and wind and just kinda being under a plastic bag doesnty seem tyo healthy but if its just for 12 hrs on 12 hrs off shoud it be ok?