Blog POLL: Should greenhouse or vertical farm hydroponics be allowed to be certified organic? By urbanagnews - March 16, 2016 0 1769 Facebook Twitter Linkedin Tumblr Should greenhouse hydroponics or vertical farm hydroponics be allowed to be organically certified? Thank you to all who have participated in our poll! A ton of you did! Here are the results as of March 15, 2016 This poll is now closed.