Best Humic Acid For Plants: Compare 10 Soil Amendments

#1 · Best Overall

1. Farm Made Organics Humic+

• Form: Liquid
• Weight: 2.3 lb

Best for: Leonardite liquid for mixed plantings.

Why it ranks #1: Its liquid concentrate specifies 5% Leonardite-derived humic acid and adds fulvic acid, sea kelp extract, and soluble potash for varied garden uses.

A 5% humic-acid concentrate sourced from Leonardite gives Farm Made Organics Humic+ a clearly stated strength for gardeners treating more than one planting area. Its liquid form blends humic acid with fulvic acid, sea kelp extract, and soluble potash, supporting a soil-conditioning routine across lawns, flowers, vegetables, shrubs, and trees.

The 32-ounce liquid concentrate suits gardeners who want one product for lawns, gardens, flowers, vegetables, shrubs, and trees, rather than separate amendments by planting type. Leonardite-derived humic acid is combined with fulvic acid, sea kelp extract, and soluble potash; the listed blend is intended to support roots, soil biology, and nutrient uptake. Because the supplied details do not give a dilution rate or application schedule, buyers should use the product directions for mixing and frequency.

Skip it if you need a stated mixing ratio before choosing a liquid; GS Plant Foods Humic Acid lists OMRI status and a gallon format.

A practical fit for gardeners seeking one Leonardite-derived liquid for lawns and varied garden plantings, with added fulvic acid, kelp, and potash. Check the product directions for dilution and application timing before setting a routine.

Listed on Amazon as: Farm Made Organics Humic+ Liquid Humic Acid Soil Conditioner, 32 oz

#2 · Best Organic-Listed Liquid

2. GS Plant Foods Humic Acid

• Form: Liquid
• Weight: 8 lb

Best for: OMRI-listed liquid for organic programs.

Why it ranks #2: This Leonardite-derived liquid is OMRI Listed for organic use and is sold in a one-gallon format for soil amendment applications.

OMRI listing under the name GS Plant Foods Organic Liquid Humic Acid makes this Leonardite-derived concentrate a fit for certified organic growing programs. Its liquid form is intended to support soil structure and nutrient availability by enhancing cation exchange capacity, helping roots access nutrients already present in the soil.

The one-gallon liquid format suits growers who prefer a concentrated amendment for repeated soil use rather than a dry granule. GS Plant Foods ties its humic acid to improved cation exchange capacity and more efficient access to existing soil nutrients, connecting the product to soil conditioning rather than a stated nutrient dose. OMRI listing supports use in certified organic programs. The supplied information does not specify a dilution rate or application schedule, so buyers will need to consult the label for their workflow.

Skip it if you need a stated mixing ratio and monthly schedule; Farmer’s Secret Soil Revitalizer lists dilution at 1 ounce per gallon and monthly use.

A good match for organic-program growers seeking a gallon-format liquid tied to soil structure and nutrient access. Confirm its label directions before planning dilution or timing, since those details are not included in the supplied product information.

Listed on Amazon as: GS Plant Foods Humic Acid Soil Amendment – Leonardite-Derived Liquid Concentrate for Improved Soil Structure & Nutrient Availability – OMRI Listed for Organic Use – 1 Gallon

#3 · Highest Acid Content

3. Wallace Organic Wonder DS-80

• Form: Powder

Best for: Water-soluble fertigation powder.

Why it ranks #3: The soluble powder lists a minimum 93% humic and fulvic acids, works dry or dissolved, and supports fertigation or seed treatment.

At least 93% humic and fulvic acids and complete water solubility define Wallace Organic Wonder DS-80. The powder can be applied dry or mixed into a solution compatible with many liquid fertilizers and micronutrients, making it suited to growers who work with fertigation, seed treatment, or soil drenches.

The listed direction is half a teaspoon per gallon of water, producing a 12% solution that can be used as a soil drench or foliar application. That specific measure helps growers prepare repeatable batches, while the powder’s compatibility with many liquid fertilizers and micronutrients can fit an existing feed program. It is also described as suitable for fertigation and seed treatment. Use caution when handling and avoid skin and eye contact, as directed; it is not limited to a single application method.

Skip it if you prefer a ready-to-dilute liquid instead of mixing powder; Farm Made Organics Humic+ is sold as a liquid concentrate.

This is a strong fit for growers who mix their own solutions for fertigation, seed treatment, or foliar and soil applications. The half-teaspoon-per-gallon direction supports repeatable mixing, but the powder requires measuring before liquid use.

Listed on Amazon as: Wallace Organic Wonder, Soluble DS-80 Humic/Fulvic Acid (1lb)

#4 · Best Seaweed Blend

4. Simple Lawn Solutions Soil Hume

• Form: Liquid
• Weight: 2 lb

Best for: Seaweed and humic lawn concentrate.

Why it ranks #4: This liquid pairs 4.5% Leonardite-derived humic acid with 4% seaweed, making it a useful combined option for lawns and gardens.

A blend of 4% seaweed and 4.5% humic acid gives Simple Lawn Solutions Soil Hume a clearly specified combination for lawn and garden soil care. Its seaweed comes from Ascophyllum nodosum harvested in the North Atlantic, while its Leonardite-derived humic acid is intended to support nutrient transfer.

The liquid concentrate combines kelp and humic acid, so it suits gardeners looking for both ingredients in one lawn and garden product. The supplied details connect humic acid with nutrient transfer and identify the formula for use with a fertilizer program. Its 32-ounce bottle and liquid form fit a concentrate-based routine, though the supplied information does not give a dilution ratio or application rate. Buyers should consult the product directions before deciding how to mix it or how much area to treat.

Skip it if you require a stated dilution ratio for monthly spraying; Farmer’s Secret Soil Revitalizer lists a one-ounce-per-gallon rate and monthly schedule.

A suitable option for lawn and garden owners who want a liquid pairing of seaweed and Leonardite-derived humic acid alongside fertilizer. Check the label for dilution and coverage details, since the supplied product information does not specify them.

Listed on Amazon as: Organic Super Seaweed Humic Acid Blend- Liquid Sea Kelp for Grass and Plants – Soil Hume – Simple Grow Solutions- Natural Lawn & Garden Concentrate- Use with Fertilizer Program (32 Ounce)

#5 · Best Dilution Directions

5. Farmer's Secret Soil Revitalizer

• Form: Liquid
• Weight: 12.8 oz

Best for: Monthly liquid soil-care routine.

Why it ranks #5: The OMRI-listed liquid uses activated humics and provides a clear dilution ratio of 1 ounce per gallon for monthly growing-season application.

A stated dilution of one ounce per gallon makes Farmer’s Secret Soil Revitalizer straightforward to mix for gardeners who prefer a repeatable liquid routine. Its activated humics are described as encouraging microbial activity, and the brand recommends monthly application through the growing season, especially in fall and spring.

The 32-ounce liquid concentrate is intended to be diluted at one ounce per gallon and sprayed, giving growers a clear mixing starting point. A monthly schedule through the growing season, with particular emphasis on fall and spring, can help organize recurring soil care. The formula is described as using activated humics from organic sources and as OMRI certified organic; its stated focus is stimulating soil microbial activity rather than feeding plants directly. The supplied facts do not specify a spray rate per area.

Skip it if you need a spray amount per square foot; GS Plant Foods Humic Acid instead identifies cation exchange capacity and soil nutrient access as its focus.

A fit for gardeners seeking a liquid soil amendment with a stated dilution ratio and monthly seasonal routine. It is especially relevant for fall and spring use, but the supplied information does not give a coverage rate for the diluted spray.

Listed on Amazon as: Farmer’s Secret Soil Revitalizer – Organic (OMRI Listed) Dirt Health Booster – Liquid Compost Soil Amendment – Activated Humic Acid – Great for Fall/Spring Application (32oz)

#6

6. RAW Humic Acid

• Form: Powder
• Weight: 2.08 oz

Best for: Small-batch hydroponic and foliar use.

Why it ranks #6: The powder lists 59% humic acids and a stated yield of up to 200 gallons per 2-ounce package, with soil, hydroponic, and foliar uses.

Use across soil, hydroponic systems, and as a foliar spray is the defining flexibility of RAW Humic Acid. The powder is described as 59% humic acids and derived from Leonardite, so a small amount can serve growers who want to adapt one humic product to several application methods.

RAW’s stated solubility and 59% humic-acid content suit growers preparing a concentrated solution for different environments. The product can be used in soil, hydroponic systems, or as a foliar spray, avoiding the need to restrict it to one application path. A two-ounce package is listed as making up to 200 gallons, which supports measured, small-dose mixing; the supplied guidance also recommends starting at very low dosages and adjusting to plant response. Store it cool and dry.

Skip it if you want a bulk granular amendment for a large lawn; The Andersons HumiChar covers 12,000 square feet in a 12-pound package.

This suits growers who want a highly concentrated powder for soil, hydroponic, or foliar use and can measure small doses. Its two-ounce size makes up to 200 gallons, so consider whether that mixing volume fits your growing operation.

Listed on Amazon as: RAW Humic Acid 2 oz

#7

7. Down To Earth Granular Humic Acids

• Form: Granules
• Weight: 5 lb

Best for: Organic-production granular amendment.

Why it ranks #7: This 5-pound granular product is OMRI listed and gives a soil rate of 1–2 pounds per 100 square feet.

OMRI listing for organic production is the clearest distinction of Down To Earth Granular Humic Acids, making it relevant to gardeners who select amendments for an organic growing program. The five-pound granular product is intended for fields, turf, and vegetable gardens, with directions to mix it into soil before planting.

The granular form works well for soil preparation: directions call for 1–2 pounds per 100 square feet, mixed well, and recommend applying before planting or at least two weeks before expected harvest. That schedule favors planned bed or field work over an immediate foliar treatment. The product is not suitable for foliar application, so gardeners wanting a sprayable humic acid should choose a liquid or water-soluble option instead. Its OMRI listing supports use in organic production.

Skip it if you want to spray humic acid on leaves; RAW Humic Acid is listed for foliar use as well as soil and hydroponics.

Choose this for organic-production growers preparing fields, turf, or vegetable beds who can incorporate granules into soil ahead of planting. It is not the right format for foliar application, and the directions call for a two-week pre-harvest interval.

Listed on Amazon as: Down To Earth All Natural Fertilizers Organic Granular Humic Acids – 5 lb

#8

8. Fertilome HuMic Granular

• Form: Granules

Best for: Granules for pots, beds, and compost.

Why it ranks #8: The granular amendment explicitly covers indoor plants and gives pot-specific directions, including a teaspoon for a 9-inch pot.

Specific container directions set ferti-lome HuMic apart for growers tending both pots and garden beds: use one teaspoon for a nine-inch pot or one tablespoon for a 12-inch pot. The granular amendment is also listed for flower beds, vegetable gardens, indoor plants, and compost bins.

For container plants, the directions call for incorporating the granules into the top one to two inches of soil, watering them in, and reapplying every three to four months. Those steps make the product easy to fit into a periodic pot-care routine. It is also listed for vegetables, flower beds, and compost bins, extending use beyond containers. The product encourages root development, but the supplied details do not provide a garden-bed application rate, so follow package instructions for those settings.

Skip it if you need a stated application rate for large lawn coverage; The Andersons HumiChar lists coverage of 12,000 square feet.

This fits indoor plant owners and gardeners who want one granular amendment for pots, beds, and compost bins, with clear container measurements and a recurring schedule. For garden beds, check the label because the supplied details omit a rate.

Listed on Amazon as: Fertilome (13124) HuMic Granular Humic Acid Soil Amendment, 30 lbs

#9

9. The Andersons HumiChar

• Weight: 12 lb

Best for: Large-lawn humic and biochar coverage.

Why it ranks #9: Its OMRI-listed granular formula combines humic acid with biochar and states coverage of 12,000 square feet per 12-pound package.

A listed coverage area of 12,000 square feet makes The Andersons HumiChar a practical scale choice for broad lawn and soil work. Its combination of humic acid and biochar pairs nutrient-delivery support with a soil amendment described as lasting for decades, in an OMRI-listed dispersible granule.

The 12-pound product uses Dispersible Granule technology, which allows particles to disperse when watered and helps move humic acid and biochar into the soil. That watering-based application can fit a lawn routine without requiring a liquid concentrate. HumiChar can be used alone or blended with fertilizer, giving it flexibility within an existing fertilizer program. Its 12,000-square-foot coverage makes it suited to larger areas; follow the safety guidance, including avoiding areas where runoff may occur.

Skip it if you need a small-volume liquid for pots or targeted foliar use; RAW Humic Acid is listed for foliar applications and hydroponics.

Choose HumiChar for broad lawn or soil coverage when you want humic acid and biochar in a dispersible granule that can join a fertilizer program. Avoid use where runoff may occur, and account for its large-area format.

Listed on Amazon as: The Andersons HumiChar Organic Soil Amendment with Humic Acid and Biochar Covers 12,000 sq ft (12 lb)

#10

10. PowerGrow Humic Acids

• Form: Powder

Best for: Powder conditioner for garden soil.

Why it ranks #10: This 5-pound powder is described for gardens and soil conditioning, but the supplied details lack a concentration or specific application rate.

A screened powder size is the practical distinction of PowerGrow Systems Humic Acids, aimed at gardeners applying a dry conditioner to soil. The product links humic acids with nutrient uptake, microbial activity, water retention, and soil oxygen, while its five-pound bag offers a powder format for garden use.

This powder is positioned for soil conditioning, with listed benefits including increased nutrient uptake and microbial activity, plus water retention and oxygen in soil. Those functions make it relevant to garden beds where soil condition is part of the routine, rather than a foliar spray. The product is described as screened to a size suited for gardens. Wear protective gloves and eyewear when handling, as directed; the supplied details do not provide an application rate or mixing instructions.

Skip it if you need a specified rate for soil mixing; Down To Earth Granular Humic Acids gives directions of 1–2 pounds per 100 square feet.

Consider this five-pound powder if your garden routine centers on soil conditioning and you value the listed links to nutrient uptake, microbes, and water retention. Its supplied details omit application rates, so consult the package directions before use.

Listed on Amazon as: Humic Acids – Humic Acid Fertilizer & Conditioner (HUMIC Acid 5 LB Bag)