kelp meal and bone meal are what you need to be using for flowering.. as they are rich in 'K' (postasium) which is vital to the flowering stage. i used the blood meal (rich in Nitrogen) on my plants during veg and with good results. plants grew quickly and suprisingly hardy. and listen to Norcal about flushing the soil. Can leave an awkward chemical taste in your buds ): hahaha and we all love good health buds!