trimming of the bottom third of the plant that doesnt get any light will make her direct energy to the buds that do get light. I do to all of mine. Tried it both ways and the yield is better when trimming. Unless you like making hash.. then leave the little popcorn buds for that Just dont trim them after the 3rd week of flower... slows them down alot. Best to trim them on the day they go into flower... maybe a week or so in too.