I do LST all the way to harvest. I'll start when the plant is still in veg but as buds develop I'll move things around to make sure they all get good light. After a few weeks the net or ties can often be removed as the plant has grown set in the new position.
Hi there,You can perform LST until the end of stretching period or until the branches are stiff and not very flexible like before.If that happens, you can stop LST.Good luck and happy growing... ✌️