Richmond Hydroponics Green Bloom provides everything that your plant needs for its flowering stage of life. Switch from Green Grow to Green Bloom when you switch your plant over to flowering, or when you see buds forming in the case of autos. It is formulated into two parts intended to be used at equal quantities together for ease of use and easy planning. No supplements needed. Our Green Bloom line is intended for use every watering in inert soil media, inert soilless media, and any other hydroponic systems. This was balanced to be complete, so use with pre-fertilized soils results may give unintended results, though by bud set many potting soils may already be mostly inert and Green Bloom can really take charge. No need for Cal-Mag, no need for growth boosters. This is a complete system and was formulated to be a used standalone with minor pH adjustments depending on your water quality. For pH adjustments, we recommend citric acid or sulfuric acid based ph down, or Potassium Carbonate based ph up. Depending on your water source, you should need one or the other, but not both. We recommend avoiding phosphoric acid based ph down, which unfortunately are the most common and available. Managing phosphorus in growth is extremely important and using phosphoric acid for pH adjustment can be enough to throw off our carefully crafted ratios.