KALIX Kelp is a soluble extract from seaweed (Acophyllum Nodosum) that contains alginic acid and many other beneficial natural plant growth hormones. Seaweed extracts have shown to improve root development, plant growth, and natural resistance to environmental stress. KALIX Kelp is ideal for adding to nutrient solutions and foliar sprays. (It is NOT recommended to foliar spray Kelp during bloom/flowering stages.) Works in conjunction with all nutrient and feeding programs. 25 Lb bag.