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  • Humate / Humic Acid (45-50%) Granules (2-4mm) - Cert. Organic - 4.5kg
Humate / Humic Acid (45-50%) Granules (2-4mm) - Cert. Organic - 4.5kg

Humate / Humic Acid (45-50%) Granules (2-4mm) - Cert. Organic - 4.5kg

Stabilises Nitrogen, Conditions Soil & feeds microbes

Humic Soil Conditioner improves soil structure, stabilises nitrogen, boosts microbial activity and detoxifies pollutants. Enhances root growth, nutrient uptake, moisture retention and overall plant health for stronger, more resilient growth.
45–50% Humic Acid Granules Builds Soil Structure & Retention Fixes Nutrient Loss & Poor Soil Health
Lawns Gardens Farms
$29.95
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  • Description
  • Features
  • Specifications
  • How it Works
  • Application
  • Safety
  • FAQ
  • Reviews
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Description

Humate / Humic Acid Granules

A natural, organic way to boost your soil and plant health. *For agricultural use only

Made from Leonardite, a 70-million-year-old natural organic compound, these granules deliver a concentrated dose of nutrients, trace elements, and vitamins straight into your soil. They help plants grow stronger roots, improve soil structure, and enhance nutrient availability, perfect for gardeners, farmers, and landscapers who want healthier plants and higher yields. Safe to use near children and animals, Humic Acid Granules are an easy, organic solution to reviving tired or nutrient-poor soils.

Use Humate / Humic Acid Granules in soils low in organic carbon, where nutrients are “locked-up,” or to support root development, transplant success, and plant immunity. They are ideal for enhancing fertiliser efficiency and can be applied to all soil types and crops year-round.

Nutrient Profile: 

Humic Acid
45-50%

Why choose Humate / Humic Acid Granules:

  • Stabilises Nitrogen – Reduces leaching and volatilisation of urea and other nitrogen sources
  • Detoxifies Pollutants – Binds herbicides, pesticides, heavy metals, and other soil contaminants
  • Supports Root Growth – Encourages strong, healthy root systems for better nutrient uptake
  • Improves Soil Structure – Enhances moisture retention, aeration, and nutrient accessibility
  • Feeds Beneficial Microbes – Stimulates soil microbial activity while reducing harmful organisms
  • Increases Crop Yield – Promotes cell elongation and stronger, more resilient plants
  • Buffers Soil pH – Maintains optimal growing conditions across soil types 

Restore Your Soil & Boost Plant Health. Humate / Humic Acid Granules bring your soil back to life, unlocking nutrients, feeding beneficial microbes, detoxifying contaminants, and promoting stronger, healthier plants. Perfect for lawns, gardens, orchards, and farms, it’s the organic solution for thriving soil and maximum yields.

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Features

Specifications

Technical Highlights
Key Active Components: Humic Acid 45–50% (Granules 2–4mm)
Functional Composition:
  • High organic carbon content (stable humus fraction)
  • Naturally occurring trace minerals (non-guaranteed analysis)
  • Granular 2–4mm prill for slow soil breakdown
  • Derived from oxidised lignite / leonardite (humate source) 
Humate / Humic Acid Granules are a soil conditioner and nutrient retention system. They:
  • Increase cation exchange capacity (CEC) → holds nutrients in the soil
  • Improve soil structure and aggregation
  • Enhance water retention and root zone stability
  • Stimulate beneficial microbial activity
  • Help buffer pH and reduce nutrient lock-up
  • Improve fertiliser efficiency and nutrient availability over time 

How it Works

 

The Science Behind Humate / Humic Acid Granules:

Humate / Humic Acid Granules work by improving soil health, nutrient availability, and plant resilience. They not only support strong root systems and microbial activity but also enhance fertiliser efficiency and overall crop productivity. Key benefits include:

  • Nitrogen Stabilisation: Reduces nitrogen loss through leaching and volatilisation, improving fertiliser efficiency
  • Soil Detoxification: Binds herbicides, pesticides, heavy metals, and other pollutants in the soil
  • Root Support: Encourages strong, fibrous root systems for better nutrient and water uptake
  • Soil Structure & Moisture: Improves porosity, aeration, and water-holding capacity, aiding plant growth
  • Microbial Stimulation: Feeds beneficial soil microbes while suppressing harmful organisms
  • Plant Health & Yield: Stimulates cell elongation, disease resistance, and overall crop productivity
  • pH Buffering: Helps maintain optimal soil pH for nutrient availability

Application

 

Application Type Rate
Lawn & Turf: 2.0-5.0kg/100sqm (200-500kg/Ha)
Plants & Garden: 2.0-5.0kg/100sqm (Handful/pot)
Potting Mix: Add at 2.5-10% (0.5 - 2.0kg/25 litres or 20-80kg/m³)
Vegetables: 1.25-3.75kg/100sqm (125-375kg/Ha)
Fruit: 3.75-5.0kg/100sqm (375-500kg/Ha)
Cereals: 2.0-3.75kg/100sqm (200-375kg/Ha)
Broadacre: 2.0-5.0kg/100sqm (200-500kg/Ha)
  APPLY EVERY 3 MONTHS

 

NOTES: 

  • Can be used on vegetable crops, trees, vines, and all soil types.
  • Compatible with almost all liquid fertilisers, nutrients, pesticides, herbicides, fungicides, and defoliants.
  • Apply with fertiliser or use in side dressing, water runs, pre-planting, and seeding applications.

 

Safety

Safety Guidelines

May be harmful if swallowed. If eaten seek medical help. ALWAYS TRIAL BEFORE CHANGE. Before a new rate, product or application method is used, a small trial is recommended. Warranty of this material, either expressed or implied, is limited to a guarantee of the composition as shown on this label in as much as uses are beyond the seller’s control. For the same reason, the seller is not liable for any injury to any living thing, crops, soils, or materials which may result from the use or storage of this material. As this is largely a mineral-based fertiliser made from natural resources, the analysis may change slightly.

STAINING WARNING: Staining may occur during application.

FAQ

What are humic acid granules?

Humic acid granules are a concentrated organic soil conditioner derived from natural leonardite. They improve soil structure, increase nutrient retention, and stimulate microbial activity.

What are the benefits of using humate in the garden?

Humate enhances nutrient availability, boosts root growth, improves soil aeration, and increases water-holding capacity. It's ideal for improving sandy, clay, or compacted soils.

Is this product certified organic?

Yes. Our Humic Acid Granules are certified organic and safe for use in all gardens, including organic food production, native landscapes, and eco-conscious lawn care.

What types of soils benefit most from humic acid?

All soil types can benefit, but it's especially useful in sandy soils (to hold nutrients and water) and clay soils (to improve structure and drainage).

Is this safe to use on lawns, vegetables, and fruit trees?

Yes. These granules are safe for all plants, including lawns, veggie patches, fruit trees, natives, and ornamentals. They improve overall plant health without burning roots.

How often should I apply humic acid granules?

Humic acid can be applied regularly throughout the year as part of your soil conditioning program. Refer to our Product Usage Guide for seasonal advice.

Can I use humic acid with other fertilisers?

Yes. Humic acid enhances the efficiency of other fertilisers by helping them stay in the root zone longer and making nutrients more available to plants.

Will this product help improve poor or tired soils?

Absolutely. Humate granules are excellent for rebuilding soil organic matter and long-term soil fertility. They support microbial activity and healthier plant growth.

How do I apply humic acid granules?

You can spread them by hand or with a broadcast spreader and water them in well. They are suitable for lawns, garden beds, tree plantings, and even native areas.

Is this a fertiliser?

No, humic acid is not a fertiliser in the traditional sense. It doesn’t supply NPK nutrients directly but improves how plants access and absorb nutrients already present in the soil or from added fertilisers.

Reviews

5.0 / 5

customer reviews

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17 September 2025

Used on my lawn

Adam

This product combined with others from Plant Doctor have been fantastic on my lawn part of my lawn plan trying to improve my soil
25 June 2025

Great products

Jason

I started using humane granules in autumn combined with the lawn lovers pack. Lawn is holding great colour in the cold weather. Great value and ease of application.
29 May 2023

Great Product and Great Company

Serge

Very happy with this product! Fast dispatch and received my order quite quickly with no issues. I will definitely be buying this product again and I'm also looking at buying other products from Plant Doctor. Thank you to all the team for providing a very pleasant purchasing experience.
2 April 2023

Humic acid granuies

Michelle

As an independent agronomist I was given some Humic acid granules to try. I applied them to an area where I sowed new seed for lawn. I didn’t have enough to do all of it but thought great I may see a difference. A year layer and preparing the preparing the area for seed again I could see the difference. The soil was darker, better structure and had better water moisture holding ability. Highly recommend this product for establishment whist the liquid Quantum H is great for ongoing improvement.
15 March 2023

Humic acid is a MUST

Zac

Humate is a great way to get humic acid into the soil at an affordable price, application is a breeze and results speak for themselves, cant recommend this enough.
11 February 2022

By far the best thing I’ve done this season

Andrew

I’ve long used liquid humic acid for my turf, but incorporating this granular formation has made a huge difference to this season. Seems to “magnify” the effects of other products.
11 January 2022

Chelating agent

Colin-John

In the last year I have had success with liquid Quantum H so thought I would put down a longer term slow release granular humate. I am hoping at maximum label rates the detoxifying and chelating effect will reduce dog urine burns on the lawn which is the only thing holding my turf back now.
11 June 2021

Extra soil supplement

Anferny

Having used the Quantum H product as the humic acid in liquid form which acts very fast but for short period of time. Then decided to try in a granular form of the product and cant be more happier and can see result after few application as the lawn still staying lush and green compare to last winter was getting lots of purple blade due to sudden dropped in temperature. Another product would recommend people to try on their lawn or even garden plant.
28 June 2020

Great value

Christopher

Great product and cost effective
21 June 2020

Love this stuff

Aaron

Used this product when seeding a couch lawn in summer. After previously seeding without it, the results were significant. Germination was great, and the lawn was quick to fill in and is still going strong into winter.
24 August 2019

Great for healthy roots

Kris

Used when seeding ryegrass. Created a really strong root system in no time at all.
2 August 2019

HuMATE!!

robert

Added to my lawn and around plants. Soil is much richer after using 3 months ago with lots of worm activity. Very easy to use.
16 April 2019

Black Gold!!

robert

So easy to use. Premixing really helps avoid blockages.
7 November 2018

Humate for my Lawn

Sean

Just received my delivery of Humate. It arrived on time and as promised. I've already applied it to my lawn and looking forward to seeing the results.

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5.0 / 5

Customer reviews

customer reviews

Showing the 3 newest

View all reviews
17 September 2025

Used on my lawn

Adam

This product combined with others from Plant Doctor have been fantastic on my lawn part of my lawn plan trying to improve my soil
25 June 2025

Great products

Jason

I started using humane granules in autumn combined with the lawn lovers pack. Lawn is holding great colour in the cold weather. Great value and ease of application.
29 May 2023

Great Product and Great Company

Serge

Very happy with this product! Fast dispatch and received my order quite quickly with no issues. I will definitely be buying this product again and I'm also looking at buying other products from Plant Doctor. Thank you to all the team for providing a very pleasant purchasing experience.
See all reviews in the Reviews tab

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Customer Reviews

First time owning lawn. Gave the team at plant doctor a ring and they supplied me with a wealth of information. Products turned up quickly.

Billy Green

Will definitely be getting more 8 weeks difference been using stimulizer, activ8mate, soil wetter, seaweed secrets and champion fertiliser. Was super fast delivery.

Michael Preddy

Only have great things to say about Plant Doctor. Organic products and a competitive price, fast shipping and easy to contact with questions. Have had great results with the special mix for lawns, and my plants (indoor and outdoor) love the seaweed secrets. I am excited to test out some of the animal products soon!

Tim McAuliffe

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