Many of the top growers are advising against this type of fertilizer for flowering. You need to get some N in there to keep the lower limbs from dying. When the plant can't get enough N for flowering, it starts feeding off of itself and the limbs begin dying from the bottom up. That's what I've learned from Uncle Ben, Riddleme, Roseman, and several other experienced growers. Read up on Uncle Ben's thread about tricks and tweaks.you want low N high P and K. In the First week Of flower I give my plants some stuff that is 0-42-54 or something like that, it helps the plant to initiate flowering.