Grow More® Humic Acid 12% — 2.5 gal

Leonardite-Derived Liquid Humic Acid for Improved Soil Biology, Nutrient Uptake, and Plant Vitality

Grow More® Humic Acid 12% is a concentrated liquid humic acid derived from Leonardite — one of the richest natural sources of biologically active humic substances. Containing 12% humic acid, this versatile soil and plant supplement serves as a premier substrate for beneficial soil microorganisms, improves soil structure and fertility, and enhances the efficiency of nutrient uptake from any fertilizer program. Suitable for indoor and outdoor plants, it integrates seamlessly into coco coir, hydroponic, potting mix, and native soil growing programs.

Key Features & Benefits

• 12% Humic Acid from Leonardite: High-concentration humic acid derived from Leonardite, one of the most humate-rich geological deposits available — providing a consistently potent, high-quality humic acid source with predictable biological activity.
• Promotes Beneficial Soil Microbial Communities: Humic acid is one of the most effective natural substrates for fueling the growth of beneficial bacteria and fungi in the root zone — supporting the soil ecosystem that cycles nutrients, produces plant growth hormones, and protects roots from pathogens.
• Improves Soil Structure and Fertility: Regular humic acid application improves the physical structure of growing media by promoting aggregate formation, improving water retention in sandy media, and improving drainage in compacted media — enhancing the long-term fertility and productivity of the growing environment.
• Enhances Nutrient Uptake: Humic acid improves the cation exchange capacity of growing media, increases root membrane permeability, and forms complexes with mineral nutrients that facilitate more efficient absorption through root cell membranes.
• Flexible Application: Can be applied as a foliar spray for direct leaf absorption, or as a water feed mixed into irrigation solution — providing application flexibility to suit any growing situation.
• Universal System Compatibility: Effective in coco coir, hydroponic systems, potting mixes, and native soils for both indoor and outdoor plants. Designed to complement any fertilizer program without interference.

Who Should Use This

Grow More Humic Acid 12% is an essential soil biology and nutrient efficiency supplement for all growers — from home gardeners using it in potting soil to commercial producers incorporating it into hydroponic nutrient programs. It is particularly valuable for growers who want to improve the biological health of their root zone, reduce fertilizer waste through improved uptake efficiency, and build long-term soil fertility across growing cycles.

Compatibility

Add to your irrigation water or nutrient reservoir at the recommended rate. Compatible with all fertilizer programs and nutrient lines. Can be used as a regular maintenance addition at every watering or as a periodic soil drench for intensive biological stimulation. Pairs effectively with mycorrhizal inoculants, beneficial bacteria, and other biological inputs. Available in 8% (1 gallon) and 12% (2.5 gallon) concentrations.

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. For applications requiring higher doses of humic acid or when treating larger volumes of growing media, the 12% offers more concentrated application at a lower volume. The 8% formulation provides the same biological benefits at a lighter concentration, which can be more suitable for foliar application or for growers who prefer a lower-concentration, higher-volume treatment 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 and oxidization, resulting in exceptionally high concentrations of biologically active humic and fulvic acids. Leonardite-derived humic acids are more biologically active and more soluble than humic acids derived from lower-grade sources such as standard coal or composts.

How does humic acid improve nutrient uptake in hydroponic systems?

In hydroponic systems, humic acids improve nutrient uptake primarily through two mechanisms: they increase root membrane permeability, allowing nutrients to cross into root cells more efficiently; and they form humate complexes with mineral nutrients (particularly micronutrients) that facilitate their transport through cell membranes via carrier-mediated uptake pathways.

Can humic acid be used as a foliar spray?

Yes. Grow More Humic Acid is specifically listed as suitable for foliar application. Dilute to the recommended rate for foliar use (typically lower than root drench rates), apply during lights-off or cooler conditions for best absorption, and ensure thorough coverage of leaf undersides where absorption is most efficient.

How often should I apply humic acid?

For ongoing soil biology support and nutrient efficiency improvement, applying humic acid at a low dose with every watering is more effective 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.