When considering every great product that Custom Hydro Nutrients offers, I still consider kelp meal to be the most fundamental, indispensable, multi functional and effective nutrient. It contains a broad spectrum of micronutrients, hormones and cytokins. It builds humus in soil. It increases plant hardiness and resistance to insects and cold. I think many gardeners probably dating back to prehistoric times would testify as to the value and effectiveness of this product. The Acadian Seaplants brand has been consistently excellent in my experience. Thank You!