No real reason besides controlling the height. Looks like it'll produce more thoughJust curious why you're doing LST? I read about it but was scared on my first grow. Now that I am nearing the end I think it may of been then right choice with Blue Dream. It is mostly sativa and the nugs are all well spaced and lots of light gets through. It will be interesting to see how yours end up. I will be watching to the end. Best of luck!