Onnu Biochar

Pure Biochar

£24.00 GBP

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Natural and sustainable soil improver for growing strong, healthy plants. Perfect for bountiful gardens, raised beds, borders or potting mixes, or commercial applications in horticulture or landscaping.

Size 20L Bag 40L Bag Bulk bag (1.7 m3)

Quantity

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✅ EBC-Certified Biochar ✅
📦 Free Shipping on all 20L & 40L bags 📦
🌿 Peat Free 🌿

100% Pure Biochar (EBC Certified)

Biochar is nature’s way to make soil rich and fertile. Used in farming for thousands of years, biochar is a carbon-rich material that improves soil health, even in poor or degraded soils, for long periods of time.

The porous nature of biochar supports beneficial microbial growth and soil structure, leading to better nutrient cycling rates, aeration and moisture retention.

Derived from sustainable local wood waste using a process called pyrolysis, our biochar can increase the size and health of your flowers, trees, plants, fruits and vegetables.

Our biochar is EBC-certified, ensuring our products are safe, effective, and environmentally responsible. Find out more about what EBC-certification means here.

Want a full rundown on biochar, how it is made, it's benefits and sustainability credentials? Click here to find out more.

Our biochar is produced to a particle size of between 5-20mm. The majority of the biochar you receive will be this size but, due to the pyrolysis production process, there may be a small amount (≈5%) that is either bigger or small than this size.

Key Features

Porosity – Biochar’s porous structure provides a large surface area that can hold water and nutrients, making them more available for plant roots and supporting soil health.

Water Retention – Its unique composition helps soil retain moisture, reducing the need for frequent watering and supporting plants during dry periods.

Nutrient Retention – Biochar can absorb and slowly release nutrients, helping to prevent nutrient leaching and providing a steady nutrient supply for plants over time.

pH Modification – Biochar can help neutralize acidic soils, making it beneficial for improving soil pH balance and creating a favourable environment for a wide range of plants.

Enhanced Microbial Habitat – The porous structure offers an ideal habitat for beneficial microorganisms, promoting healthier soil ecosystems and enhancing plant growth.

Improved Soil Structure – Biochar can loosen compacted soils, improve aeration, and prevent soil erosion, supporting root development and soil resilience.

Pollution Remediation – Biochar can adsorb heavy metals and toxins, helping to remediate contaminated soils and improve environmental quality.

Application

Mixing Ratio: For best results, blend 10-20% of biochar by volume with your soil or compost. This mix provides the ideal concentration to efficiently improve soil structure, enhance nutrient retention and support healthy microbial growth, without overwhelming the soil composition.

Application Depth: Biochar works best when it’s applied to the plant root zone. This allows plants to gain direct access to the biochar’s moisture retaining and nutrient absorption properties.

For seeds and seedlings, apply biochar directly to soil at planting depth, but in a lower concentration of around 5-10%.

For established plants, apply biochar as a layer of top dressing around the plant base. Over time, watering and changes to the soil structure will draw the biochar to the root zone.

Root Zone Application: When applying biochar around roots, maintain a concentration of 10-20% by volume.

Watering Guidance: After applying biochar, give the soil a light watering to help integrate it with the surrounding soil and to ensure the biochar is activated. This initial watering supports the biochar’s ability to hold moisture, but take care to avoid overwatering, as excessive water can cause nutrient leaching.

Postage and Packaging

Shipping is free on all 20L & 40L bag purchases. Bulk bags are shipped on a pallet costing £49.99 each.

We expect to send out orders within 5 business days of receiving them, and they should arrive within 2-3 business days.

Please note: due to our evolving sustainable packaging strategy, product may not be shipped with the same bag design as shown.

Bulk enquiries

Looking for more than 5 bulk bags? For larger orders in bulk bags or delivered loose, and to benefit from our volume discounts, visit our commodities business, Onnu Bioflow, or email info@onnubioflow.com.

Onnu Bioflow

Want to trial biochar?

Running a trial? We can advise on how to set it up so you can measure the impact of the biochar. Contact us for more information!

Biochar

Factsheet

Our factsheet is a comprehensive guide for biochar and how it works. With summaries, glossaries, property tables, product descriptions and application rates, this fully-referenced factsheet can help you familiarise yourself with the world of biochar.

Download

Additional

Services

Biochar Implementation Plan

A tailored strategy to integrate biochar into your soil management and growing practices.

Learn More

Biochar Trial Support

Personalised consultations to address your unique soil challenges and goals.

Learn More

Biochar Bespoke Blends

We can make a bespoke product to match your precise requirements.

Learn More

Biochar Sieving

Whether you need fine biochar, or larger particles, our sieving service ensures consistency and quality in every bag you receive.

Learn More

The Grass is Greener

Tried a few composts before to try and bring my grass back to life with little to no impact, but the Biochar actually made a real difference. The soil is healthier, holds moisture better and my lawn is the envy of my neighbours Highly recommend it if you’ve been let down by other products.

Pure Biochar - great for home gardening!

Really impressed with Onnu Biochar’s Pure Biochar product. The quality is consistently high and it blends easily into soil and noticeably improves overall plant health. As a home gardener, I couldn't recommend it enough!

Biochar Compost

Really happy with my order. Everything arrived quickly and well packaged. The quality of the product is exactly as described. Had a quick question after checkout and got a helpful reply the same day. Will definitely order again!

Excited to see the outcomes!

Product was shipped and received on time. Will be using over the weekend and excited to see how the inoculated biochar performs compared to other products I have used in the past.

Item added to your cart

Pure Biochar

Pure Biochar

✅ EBC-Certified Biochar ✅

📦 Free Shipping on all 20L & 40L bags 📦

🌿 Peat Free 🌿

100% Pure Biochar (EBC Certified)

Key Features

Application

Postage and Packaging

Customer Reviews

Bulk enquiries

Want to trial biochar?

Biochar

Factsheet

Additional

Services

Biochar Implementation Plan

Biochar Trial Support

Biochar Bespoke Blends

Biochar Sieving

Onnu Biochar

Let customers speak for us