I thought I would share my technique, I like to build a grow room within a room, I make the wooden structure and then partition it with 1/3 for vegging and mother plants and the remaining 2/3 is the flower room. I make each section its own environment, using individual intakes, exhaust and circulation fans. I start off with 6 seedlings and choose the best 3 to make mother's from and flower the other 3. After 4 months I take 12 - 18 clones from 1 mother, after a month when the clones are moved into vegging room I move that mother to the flowering room. after 2 weeks vegging those clones I will take the next set of clones from the second mother, and move the original clones into the flowering room. I do this until the last set of clones and then take away the partition between the 2 "rooms" for the last batch. This gives me 3 crops a year as well as 6 Christmas trees. After the final harvest I tear down the room in 1 day and look for another house to rent.