This amazing soil amendment is a great addition to any potting soil or garden. Comprised of granular humic acid, kelp flakes, soluble humic acid, and soluble kelp extract compressed into granules that increase soil cation exchange capacity through chelation. The humic acids work at enhancing availability of organic fertilizers within your growing medium, while the kelp meal and extracts provide essential micronutrients and potassium. Available in 5 lb. and 50 lb. bags.