When: Anytime after the 4th set of ADULT leaves is fully unfolded. Top early for better height control and side shoot production. And no less than 2 weeks before you intend to flower.

How: Pinch off the growing tip.

Why: To increase number of growing tips for cloning or more bud sites. To give a different shape to the plant. To control height. To take advantage of your lights better, especially true when using flouros. To give shoots that may be used in a SCROG setup.