as I understand it, SCROG (screen of green) simply makes it easier to train the growing stems horizontally, under the screen ... then, the stem will produce buds all along its length, with each bud getting full exposure to the light source ... it works, but be sure you use it in a setup where you have easy access to all plants, as it is a bit of a pain in the ass to keep it trained, if you cant get to the branches easily ... :smokin: