FIM Technique: There is a topping method known as the FIM technique. If you push the leaves apart at the very top of the plant you should see a small bud (not a flowering bud but an actual leaf bud). use a pair of nail clippers to pinch off about 3/4 of the bud. this should result in more than two top colas being developed. In a single FIM clipping you can produce up to eight new top colas. The Origins of this technique are humorous. as the story goes, FIM was discovered accidentally when a grower messed up a topping exercise. FIM stands for "Fuck I Missed".

Book: The Cannabis Grow Bible by: Greg Green