thanx for the replies....the reason i was asking is because since this is my first grow, i didn't want to mess with it much.....but now i'm looking at my main cola, and its one HUGE bud....and i was a little bitter about not topping it off while it was vegging, to make 2 HUGE buds.....but if you're saying it didn't really increase yeild, I dont feel so bad now. (I'm 5 weeks into flowering)