LST is so low stress that it can essentially be performed throughout the lifecycle of a cannabis plant. By starting in the seedling stage, you have maximum control over your plant from the get-go. LST is “done” when a cannabis plant starts stretching, about halfway through flowering. While you can still bend and manipulate the plant all you want for light penetration, LST during flowering will not cause any other growth. Hopefully, I answered your question and remember Happy Growing and Free your mind one puff at a time.