Athosanswered grow question 6 years ago Tricky question. After the plant has developed the 4th node, it is considered ready to be toped since it has enough root mass to recover quickly. That does not mean that you have to TOP at that point, you can do it later depending on what you want to achieve. Except autos, that have to be toped above the 4th node and no later, else they start flowering.