It is always best to start the LST on flexible plants that are still growing. The stem and shoots tend to become harder and develop a thicker bark as the flowering progresses. That makes the LST risky. However, hopeless situations sometimes require the most determined way out. LST is the preferred last resort. It is better to bend the thickest flowers away from the grow lamp than to risk being burned by the light in late bloom. But be careful, because LST after the first three weeks of flowering can often end in a break, because it ends in a bend. But don't panic if you actually break a branch. Bandage the wound with tape.
Is from Zamnesia .com