Knowing what I know about growing just a rule of thumb is to topp at the 4 knod after reviewing the strand that i have (Swiss Cheese) which is a new strand for me that Im trying out. I read that the major growth doesnt start going until you top it. The probleming being is that it only about 5 inches tall but already has the begining of it 6th knod..I also read that you really dont want to top your ladies until it reaches a foot or two.. Can anyone help????