Mindfully extracted from ancient deposits, DTE Granular Humic Acids are unaltered, oxidized lignite. After extraction, this decomposed plant material is crushed, screened and graded to a particle size of 1-3 mm, creating a highly concentrated source of humic substances. Add these humic acids to fields, gardens, potted plants and turf to improve water-holding in the soil and to aid the plants ability to uptake micronutrients. Suggested Uses: Add to soil to increase water-holding and infiltration in the soil and to help increase micronutrient uptake by plants. Shop All Down to Earth products here .