Grow More® Humic Acid 12% — 2.5 gal

Leonardite-Derived Liquid Humic Acid at 12%, 2.5 gal, for Soil Biology and Nutrient Uptake

Feeding a fertilizer program without feeding the soil biology underneath it leaves real efficiency on the table — nutrients that go in don't all make it to the plant. Grow More Humic Acid is derived from Leonardite, one of the richest natural sources of biologically active humic substances, and works as a substrate for beneficial soil microorganisms, improving soil structure and the efficiency of nutrient uptake from whatever fertilizer program is already in place.

At 12% concentration in the 2.5 gal size, this liquid humic acid integrates into coco coir, hydroponic, potting mix, and native soil programs alike, applied as a foliar spray or mixed into irrigation water.

Key Features & Benefits

• 12% Humic Acid From Leonardite: Derived from one of the most humate-rich geological deposits available, providing a consistently potent, high-quality humic acid source.
• Promotes Beneficial Soil Microbial Communities: Humic acid is one of the most effective natural substrates for fueling beneficial bacteria and fungi in the root zone.
• Improves Soil Structure and Fertility: Regular application promotes aggregate formation, improves water retention in sandy media, and improves drainage in compacted media.
• Enhances Nutrient Uptake: Improves cation-exchange capacity, increases root membrane permeability, and forms complexes with mineral nutrients that facilitate absorption.
• Flexible Application: Applied as a foliar spray for direct leaf absorption or as a water feed mixed into irrigation solution.

Who Should Use This

Home gardeners using it in potting soil and commercial producers incorporating it into hydroponic nutrient programs are both a direct fit, particularly growers who want to improve root-zone biology, reduce fertilizer waste through better uptake efficiency, and build long-term soil fertility across cycles.

About Grow More Inc.

Grow More Inc., founded in 1918 as National Chemical Company in Hollywood, California and now based in Gardena, California, offers Humic Acid at two concentrations to fit different application volumes and rates.

Frequently Asked Questions

What is the difference between the 8% and 12% humic acid concentrations?

The 12% formulation contains 50% more humic acid per unit volume than the 8% formulation. The 12% offers more concentrated application at a lower volume for larger treatment areas, while the 8% suits foliar application or growers who prefer a lower-concentration, higher-volume approach.

Why is Leonardite considered a superior source of humic acid?

Leonardite is a highly oxidized, naturally occurring form of lignite that has undergone millions of years of decomposition, resulting in exceptionally high concentrations of biologically active humic and fulvic acids. Leonardite-derived humic acids are more biologically active and more soluble than those from lower-grade sources such as standard coal or composts.

How does humic acid improve nutrient uptake in hydroponic systems?

It increases root membrane permeability, letting nutrients cross into root cells more efficiently, and forms humate complexes with mineral nutrients — particularly micronutrients — that facilitate transport through cell membranes via carrier-mediated uptake pathways. This dual mechanism is one reason humic acid pairs well with an existing fertilizer program rather than replacing it.

How often should I apply humic acid?

Applying a low dose with every watering is generally more effective for ongoing soil biology support than infrequent high-dose applications. As a biological food source and soil conditioner, consistent low-level supplementation maintains the microbial and structural benefits over the full growing cycle.