Last time I was given advice like that mate it sounded mad as hell, but once done
(you will see what these pros are talking about lol)
Mine was in veg still I nipped the main stem and was told to chop two nodes down I refused lol, but few spliffs later his explanation made allot of sense so I did it while still stoned lmao...
The results is my avatar pic, so far in my 1 tiny year of growing I never have grown one that good yet.
It makes all the other tops at equal level to battle for main cola job, and it fun to watch em all go as fat as the main colas