I haven't brought a cannabis crop through harvest in a greenhouse but have worked in them before, growing other crops. Humidity and the diseases that follow it are the main problem. You will want a way to exhaust all air and moisture when the outdoor weather is fair, and then be able to protect your crop against heavy rain when it's not.
You may have to install sulfur burners to keep rot down, but again, I'm not an expert so if I were you, I'd head over to a larger site (ICMag) that has a greenhouse-specific forum and look at the logs of people who are growing in your area.
stinkyattic Reviewed by stinkyattic on . outdoor growing in pacific northwest: greenhouse? anybody have any ecperience with greenhouse growing? i'm thinking it could work in a wet NW climate Rating: 5