I heard growing Northern lights is a low odor strain. But having extra space figured into the greenhouse design to grow some legal and Very Odiferous plants that kind of "compliment" the odors of your grow is key to keeping those in line. And since greenhouse temps are fairly warm even in midwinter, i've heard to be usually around 65-75degrees when its 10-20outside, meaning lilacs for example just may overpower skunkbud. Then filtering and activated charcoal,etc will tame it down..