How Humic Acid Can Help Your Lawn Thrive

A lush, vibrant lawn is more than just an attractive feature of your outdoor space; it's a testament to the care and attention you invest in your surroundings. However, the quest for a healthy lawn goes beyond regular mowing and watering. The secret to a truly thriving lawn lies beneath the surface, where the health of the soil plays a pivotal role. One of the most remarkable natural substances that can work wonders for your lawn's appearance is humic acid.

Unless you're deeply engrossed in soil science, farming, or gardening, the term "humic acid" might not ring a bell. Yet it’s one of Mother Nature’s treasured gems.

What Is Humic Acid?

Humic acid is a natural organic compound that forms from humate due to the decomposition of plant and animal matter over time. It's the residue left after the worms, beetles, and soil microorganisms have done their magic on decaying leaves and roots. It's a crucial component of humus, the dark, nutrient-rich layer of soil that provides the ideal environment for plant growth. The end result is a substance rich in humic substances, including humic and fulvic acid.

Different soils have varying levels of humus. For instance, sandy soils have little. This makes growing a lawn on sandy soil more challenging. Similarly, unimproved clay soils often find themselves in short supply of humus. You can't spot it with the naked eye; the molecules are too tiny. However, the stark difference between lawns rich in humic acid and those lacking it is easy to see. 

Composition and Properties

Humic acid is composed of a complex mixture of organic molecules, each with its own unique properties. Chemically, it's characterized by its high content of carbon, hydrogen, oxygen, nitrogen, and other trace elements. The molecular structure of humic acid is incredibly intricate, forming colloidal particles that play a critical role in soil aggregation.

One of the best properties of humic acid is its ability to chelate or bind with essential nutrients, making them more accessible to plants. This chelation process prevents valuable nutrients from leaching away, ensuring they remain available for plant roots to absorb.

Fulvic acid and humic acid bear striking resemblances. On a molecular level, humic acid slightly surpasses fulvic acid in size and thrives in alkaline soils, whereas fulvic acid shines in both alkaline and acidic soils.

Seeking out either one individually isn't really necessary. The truth is that most lawn products enriched with humic compounds contain a combination of both humic and fulvic acids. For most do-it-yourself lawn enthusiasts, it's unlikely that distinguishing between humic and fulvic acid supplementation is crucial. Just ensure that one or the other, or both, are clearly indicated on the label of the product you choose to purchase.

The Organic Connection

What sets humic acid for lawns apart from purely synthetic fertilizers is its organic origin. This inherent organic nature makes it an ideal addition to sustainable lawn care practices. Unlike strictly synthetic fertilizers that can contribute to nutrient imbalances and soil degradation over time, humic acid supports the natural processes that promote soil health and longevity.

For instance, when you mulch your borders with compost or bark mulch, you provide soil microbes with the materials to create humic acid. But you don’t really want to mulch your entire lawn (bark is not great for your mower blades!) Applying humic acid in granular or liquid form, as a single product, or as part of a fertilizer is the best way to add it to your soil.

Related reading: Top Tips for Fertilizing Your Lawn: Choosing the Right Lawn Fertilizer


The Role of Humic Acid in Soil and Grass Health

Humic Acid in Soil and Grass Health

A healthy soil ecosystem provides the foundation for robust plant growth, and humic acid plays a pivotal role in nurturing this ecosystem by:

1. Improving Soil Structure and Aeration

One of the primary contributions of humic acid to soil health is its ability to enhance soil structure and aeration. Over time, soils can become compacted and devoid of the air spaces that roots need to breathe. Humic acid's colloidal nature acts as a binding agent, promoting soil aggregation and creating a more porous structure. This improved structure allows for better water infiltration and air circulation, creating an optimal environment for root development.

2. Enhancing Water-Holding Capacity

A well-hydrated lawn is a healthy lawn. Humic acid's unique properties enable it to increase the soil’s water-holding capacity. By effectively retaining moisture, humic acid helps plants withstand dry spells and reduces the frequency of irrigation. This conserves water and ensures your lawn remains resilient despite varying weather conditions.

3. Promoting Nutrient Availability and Uptake

Nutrient availability is a critical factor in lawn health. Humic acid's chelating abilities play a crucial role in this. It forms complexes with essential nutrients, preventing them from leaching away. This helps keep them accessible to plant roots. Humic acid increases nutrient uptake, promoting healthy growth and vibrant green grass.

Furthermore, humic acid fosters beneficial microbial activity in the soil. These microbes break down organic matter, releasing nutrients in a form that plants can readily absorb. This symbiotic relationship between humic acid and soil microbes creates a thriving ecosystem that supports plant nutrition.

4. Enhancing Stress Tolerance

Lawn stressors such as drought, heat, and disease can affect its appearance and health. Humic acid helps alleviate these stressors by boosting the lawn's natural defenses. Improved nutrient availability and water retention equip plants to better withstand periods of environmental strain. As a result, your lawn becomes more resilient, maintaining its beauty even under challenging circumstances.

5. Stabilizes Soil pH Levels

Humic acid can impact soil pH, but it doesn't directly neutralize pH in the same way that traditional pH-adjusting materials like lime or sulfur do. Instead, humic acid can influence pH indirectly through its interactions with soil particles and nutrient availability. It has a buffering effect on soil pH, meaning that it can help stabilize pH levels by preventing rapid and extreme changes in response to external factors.

If you need to raise or lower your soil's pH, we recommend using Jonathan Green Mag-I-Cal® Plus for Lawns in Alkaline and Hard Soil to lower your pH and Jonathan Green Mag-I-Cal® Plus for Lawns in Acidic and Hard Soil to raise it.


How to Apply Humic Acid to Your Lawn

How to Apply Humic Acid to Your Lawn

Now that we've explored the numerous benefits of humic acid for your soil and grass, it's time to get started. The application process may vary depending on the product and your lawn's specific needs, but here's a general guide to get you started.

1. Choosing the Right Humic Acid Product

Before diving into application methods, selecting a high-quality humic acid product is essential. Look for products specifically formulated for lawn use with a significant concentration of humic substances. 

What's essential to remember about humic acid is that it doesn't function as a fertilizer. While you can apply humic acid as a standalone treatment, we highly recommend using it straight after applying your lawn fertilizer or, even better, applying a fertilizer that includes humic acid in its ingredients. This saves you a lot of time and effort. Fertilizers which encompass nutrients like nitrogen, potassium, and iron, directly influence your lawn's color. Nitrogen and iron are important for turning grass into a lush green. 

While humic acid alone doesn't provide nutrients like these, you might still notice visible changes after a couple of applications. This alteration isn't due to humic acid nourishing the grass. Instead, it's a process where humic acid taps into dormant nutrients in the soil that were previously unavailable. By applying humic acid, you're essentially "unlocking" these nutrients, causing a noticeable shift in the lawn's color. 

Be aware that this change might only occur in some scenarios as certain soils may lack significant nutrients, which is why it's important to use it alongside or in your fertilizer. Humic acid acts like a key, releasing nutrients contained in the soil to boost plant health.

Recommended products

Among our top-recommended products is Humic Max 16-0-8, a golf course-quality granular fertilizer with 8.9% humic acid. It works well on all grass types, giving you a beautiful, deep green lawn. What's great is that it has 35% MESA slow-release nitrogen, which makes your grass green up quickly with less chance of burning. About 9% of the special Humic Max blend is pure SOP (Sulphate of Potash) potassium. This type of potassium feeds your grass without adding excessive sodium to your soil.. 

16-0-8 on lawn


For more information on the quantities you will need for your lawn, use our lawn fertilization calculator and watch this video:


Another great choice would be Complete 14-7-14, a fusion of quick-release nitrogen and Meth-Ex slow-release nitrogen, offering swift greening without excessive growth. This formula also packs a punch with 7% phosphorus, fueling improved root development.

To enhance your lawn's color and address nutrient gaps, 14-7-14 includes a trio of iron, manganese, and magnesium. This marriage of macro and micronutrients results in a comprehensive fertilizer tailored to your golf course lawn. Country Club Complete 14-7-14 also incorporates sea kelp and humic acid, elevating fertilizer absorption and nurturing plant vitality.

You can use this fertilizer on warm and cool-season lawns. In summer months, consider a switch to Country Club Stress 12-0-24 fertilizer.

14-7-14 Fertilizer on Lawn


If you’re looking for an all-natural option for your lawn, Mirimichi Green's premium organic 4-4-4 fertilizer and biostimulant will allow you to go totally organic in your lawn fertilization program.

Use it as an organic kickstart for new growth or a steady feed throughout the season. The formula includes 5% humate, 9% calcium, 0.2% iron, 4% nitrogen, 4% soluble potash, and 4% phosphate. This organic fertilizer also includes beneficial bacteria and other biological components. This blend encourages improved root development and enhances nutrient absorption, augmenting your soil's capacity to harness the potential of organic fertilizer and other product applications.

For best results, apply this organic fertilizer every 4-6 weeks when your grass is actively growing. It can be used on cool and warm-season grasses from spring through fall.

Organic Fertilizer on Lawn

2. Granular or Liquid?

Which is better, granular or liquid humic acid? Well, liquid options offer speed as they start working immediately upon application. This is because liquids have undergone further breakdown compared to granules. Essentially, liquids still contain particles, albeit in incredibly tiny sizes compared to the visible prills or grains of granular humic substances. Aside from uptake speed, liquid humic acid products don't necessarily have an advantage in terms of quality.

All granular products containing humic acid require watering in. Granular humic takes longer to break down and integrate with the soil, while liquids have a head start in this process. It's important to note that granular and liquid variants contribute positively to soil health, so whichever you choose will be beneficial.

3. How Much Humic Acid Do You Need to Apply, and When?

While you can’t really apply too much, more is not always better when it comes to humic acid. While overapplication is unlikely to damage your lawn, it’s best to follow the recommended application rates on the packaging to ensure you provide the right amount of humic acid for your lawn's needs. Besides, using more than required is just a waste of product and money.

As for how often you need to use it, applying humic acid in the spring and fall is beneficial, as these are periods when lawns are actively growing and recovering from seasonal changes. However, we recommend using it as part of your fertilization program. With this strategy, you apply it every 4-6 weeks when your turf is in growth mode. Humic acid applications are especially beneficial during periods of stress or when your soil test reveals a nutrient deficiency.  

4. Soil Testing and Analysis

For optimal results, consider conducting a soil test. Soil testing provides insights into your lawn's nutrient levels and pH, helping you make informed decisions about the type of fertilizer with humic acid to apply. Adjusting your lawn care regimen based on soil test results ensures that you provide precisely what your lawn needs. We recommend the MySoil Pro Pack, which contains two soil tests, allowing you to measure the effectiveness of your nutrient program in spring and fall.

5. Application Methods

There are a few standard methods for applying humic acid to your lawn. The method you choose depends on your preferences, the product you've selected, and the tools you have on hand.

Liquid Spray Application:

  • Dilute the humic acid product according to the manufacturer's instructions.
  • Use a sprayer like this Backpack Sprayer to apply the solution to your lawn's surface evenly.
  • Ensure thorough coverage, targeting open areas and around plants.

Granular Application:

  • Choose a granular humic acid product or fertilizer that includes humic acid, such as Humic Max®16-0-8 or Country Club Complete 14-7-14.
  • Use a broadcast spreader to distribute the granules evenly across your lawn.
  • Water the lawn after application to help the granules dissolve, moving nutrients into the soil.

Organic Matter Incorporation:

  • Mix humic acid products with compost or other organic matter.
  • Spread the mixture across your lawn and lightly rake it into the soil.
  • Water the area to help the organic matter and humic acid blend with existing soil

6. Integrated Lawn Care Approach

To maximize the benefits of humic acid, integrate its application with other essential lawn care practices. Regular mowing, appropriate watering, and proper fertilization contribute to your lawn's overall health. Humic acid acts as a complementary element in your lawn care toolbox, enhancing the effectiveness of your efforts.



Common Mistakes to Avoid

While using humic acid can offer numerous benefits to your lawn, it’s important to be aware of potential pitfalls to ensure you're using this natural solution effectively. Avoiding these common mistakes will help you maximize humic acid's potential and keep your lawn on the path to vibrant health.

1. Neglecting Soil Testing

Applying humic acid without understanding your soil's current condition is like treating an ailment without a diagnosis. Conduct a soil test to assess nutrient levels, pH, and other essential parameters. This information will guide you in making informed decisions about the type and amount of humic acid your lawn requires.

2. Ignoring Regional Climate and Conditions

Different regions have varying climates and soil types, which can impact how humic acid interacts with your lawn. Consider your local conditions when selecting a humic acid product and determining the application schedule. What works well in one area might not be optimal for another.

3. Not Integrating Humic Acid into a Holistic Plan

While humic acid offers significant benefits, it's not a standalone solution for lawn care. For the best results, integrate humic acid into a comprehensive lawn care regimen that includes proper mowing, watering, fertilization, and aeration. Each component contributes to a well-rounded approach that maximizes your lawn's health. You can add sea kelp with humic acid to get even better results.

4. Expecting Immediate Results

Humic acid's effects on your lawn's health are not always immediately visible. It's a natural, gradual process that contributes to long-term improvements. Avoid the misconception that your lawn will undergo an overnight transformation. Patience is important; consistent application over time will yield the best results.

5. Skipping Follow-Up Applications

Achieving a truly thriving lawn requires ongoing care. While humic acid can have lasting benefits, its effects gradually diminish over time. Plan for regular follow-up applications as part of your lawn care routine to maintain optimal soil health and lawn vitality.


Related reading: How Soil Tests for Your Lawn Can Save You Money


A Vibrant Legacy

As we conclude our exploration of how humic acid can help your lawn thrive, it's clear that this natural substance holds the potential to transform your outdoor space into a lush, vibrant haven. By embracing humic acid as a valuable tool in your lawn care arsenal, you're adopting a holistic and sustainable approach that benefits your lawn and the environment.

To further improve the quality of your soil, discover Mirimichi Green’s biostimulants and fertilizers for your lawn.