Im using GH nutes on my flowering plants that are on their 6th week. I just used the GH til about the 3/4th week and began using the Beasty Blooms. I lowered the bloom on the GH a touch to compensate for the added Phosphorus and Potassium the Beasty will add. I just gave my plants a good flushing so I could begin to get the plants used to the higher levels of P and K and then gradually increase over time. Just be prepared to flush more often since there will be more nutes building up in the soil. Take it slow and depending on your plants you should be able to go full doses of the Beasty in no time.