Micro-nutrients are vital for the healthy growth & development of plants. When using Michigan Nutri Gro, immediate positive effects will begin to appear as a result of Enzyme Activation, Photosynthesis, Chlorophyll Production, Nutrient Up-Take, Disease Resistance, Growth & Development, Flowering & Fruit Set, Hormone Regulation, Protein Synthesis & Stress Tolerance. While needed in smaller quantities than macro-nutrients, micro-nutrients are essential for optimal plant health and productivity.