Yeah I like to know how they get those single colas all the way down to the bottom on those tall plants too? Plus grower told me it's better to have one big main stem providing the nutrients then many little ones. But, usually it's the lower the node the bigger the branch will be so, an i dont know how they get them to stay as one main bud all way down to the bottom like that. I'm not a expert but guy mentioned force flower with 5 nodes. What about removing anything below 5 nodes before flower/during flower? Only thing I can think is keep trimming lower branches