well most greenhouses are kinda like a tropical enviroment wich most weed flourishes so it just grows faster and in some places allows u to grow all year round if u know how to force flower. how do i know well i used to grow in a greenhouse myself. its so awesome cause u can control all the varables except light(cloudy days u still get some light) kinda like indoor. sorry bout that last post it was a little abbrasive. peace