Advanced Nutrients Grow, Micro and Bloom can be combined to provide specialized nutrition for plants from the cutting/germination stage through the canopy formation and flowering stages. Formulas can be custom mixed for specific applications by combining the 3 components to suit the needs of your plants' particular growth phase. For best results: monitor nutrient concentration with a ppm meter and control nutrient strength by adding water when necessary. Replace nutrient every two weeks. Remember - always use Micro first, then add Bloom and Grow.