I let my NL clone grow to 21" high before I went to flower, and it stopped around 44" high. No SCROG or any LST. This is just what the strain will do normally: A little over double in height. If your grow room is short, you might want to keep this in mind. But also you should know that vegging longer makes a bigger plant which improves yield. Some people grow NL TREES outside and get massive yields.