You need them to have four true sets of leaves or branch nodes. Cut the top out. If you let the top go enough it can be a clone. As the branches start to come out cut the main water leaf when it's about 4 inches long. When a branch get 2 sets of leaves top out the branch and then cut off the main branch leaves a about 3 inches long. You will have a huge bush before to long. It can get out of control

This is the method of the Phototrons to get the most budding sites. However photorons don't make good buds with fluro lights so we found it to be perfect for mothers and right now I just took 28 clones last week and need to take 30 to 40 more off of it. Even more next time.