lst is low stress training. its when your in veg you can tie down your plants main stem down in small increments so that the bottom and side shoots get a chance to grow and become as tall as the main cola, making your plant grow a few main colas rather than just one. that type of plant needs it to get a better yield. you will get a good yield but better when you train it. search this site for "LST" and it will give you directions on how to do it. also if it dont turn purple dont worry about it. most of mine didnt turn purple only some but all of it tasted the same as regular grand daddy purple.