i am growing 6 sativa dom plants in a 4x4 under one 600watt. i used a standard tomato trelis. i veg my plants 8 weeks in 7 gal smart pots in fox farm soil. once i see the 4 nodes start to form i begin topping all my plants and training them around the trelis. once they begin to flower i prune the bottom 1/3 off the plant and take all bud sites ( not leaves)off until the top 2. all i grow is the top and secondary nodes. this has worked brilliantly for me and others as well. this is just what i do not advice or suggestion. you do it how you want ! i yielded 380 grams dried off my last chernobyl run. no popcorn no fluff just colas.