top of page

Biochar: A Sustainable Soil Amendment

Pile of pure biochar

The Origin of Biochar

Indigenous communities in the Amazon forest developed the soil amendment known as biochar, which has a history dating back thousands of years. This ancient practice, carried out in what they called terra preta, meaning 'black earth’ in Portuguese, aimed to improve soil fertility.

Thanks to this knowledge being passed down through generations, biochar is experiencing a resurgence in modern agriculture and horticulture. Biochar holds immense promise in revolutionizing soil health and transforming our agricultural landscapes and houseplant soil.

What Constitutes Biochar?

Biochar is a highly stable form of carbon-rich charcoal that results from the pyrolysis of organic materials such as crop residues, wood chips, or manure. Pyrolysis is derived from the Greek words "pyro" (meaning fire) and "lysis" (meaning separation). Pyrolysis has the ability to convert organic materials into valuable products while reducing environmental impact. It involves subjecting organic matter to high temperatures in an environment with limited oxygen, facilitating its decomposition.

Indigenous people took agricultural residues and covered them with soil or clay, creating an oxygen-limited environment to slowly break down the materials. In modern times, we have special equipment to facilitate pyrolysis.

Biochar vs Charcoal

Biochar and charcoal are both carbon-rich subs

tances, but they differ in terms of their production methods and intended applications. Biochar is produced through low-oxygen pyrolysis for agricultural uses whereas charcoal is produced through no oxygen carbonization for cooking, heating and industrial purposes.

Both biochar and charcoal are carbon-rich, but the exact composition and structure can vary depending on the feedstock and production conditions. Biochar typically retains more of the original biomass structure and may contain higher levels of mineral elements and residual organic matter. Charcoal, on the other hand, is often more homogeneous and consists primarily of carbon.

Biochar's Structure

Following the pyrolysis process, biochar develops a crystalline carbon structure that effectively enhances water and nutrient retention in soil. This process also ensures that the biochar achieves stability, porosity, and the absence of harmful compounds.

Biochar chips

Biochar exhibits exceptional stability and longevity in the soil. Due to its resistance to decomposition, biochar can persist in the soil for hundreds or even thousands of years, providing long-term benefits to soil health. Its stability ensures that the structural integrity and functionality of biochar remain intact, allowing it to continuously support plant growth and soil improvement over extended periods.

Biochar's Advantages to Plants

The advantages of biochar for plant roots are undeniable. Its ability to retain water, store nutrients, improve soil structure, support beneficial microorganisms, and regulate soil pH provides a favorable environment for robust root development. Biochar also has direct environmental advantages such as the sequestration of carbon, pollution remediation and waste management. By incorporating biochar into your gardening or agricultural practices, you can enhance nutrient uptake, reduce water stress, and promote overall plant vitality.

Improved Soil Fertility:

  • Biochar's porous structure provides a haven for beneficial microorganisms, such as mycorrhizal fungi and soil bacteria. These microorganisms enhance nutrient cycling, improve soil structure, and increase nutrient availability to plants. The high surface area of biochar also acts as a sponge, retaining water and nutrients in the soil, thus reducing water and fertilizer requirements.

Nutrient Retention and Release:

  • Biochar soil provides an ideal environment for nutrient retention and availability. The high cation exchange capacity (CEC) of biochar allows it to attract and hold essential nutrients, such as nitrogen, phosphorus, and potassium. This creates a reservoir of nutrients readily accessible to the roots, promoting optimal plant growth and overall health. With biochar soil, your houseplants will receive a steady supply of nutrients, reducing the need for frequent fertilization.

Enhanced Water Management:

  • The porous structure of biochar acts like a sponge, efficiently absorbing and holding moisture. This ensures that your plants have a steady supply of water without the risk of overwatering or waterlogged roots. Simultaneously, the biochar's porous nature allows excess water to drain away, preventing root rot and other moisture-related issues.

Soil pH Regulation:

  • Maintaining the correct pH level is crucial for plant health, as it directly affects nutrient availability. Biochar soil acts as a natural pH regulator, helping to balance the acidity or alkalinity of the soil. It can raise the pH of acidic soil or lower the pH of alkaline soil, creating an environment that is more favorable for your specific houseplants. By ensuring the right pH balance, biochar soil maximizes nutrient uptake and supports vibrant growth.

Improves Soil Structure and Aeration:

  • The presence of biochar in soil significantly improves its structure and aeration. The porous nature of biochar creates air pockets within the soil, promoting oxygen circulation to the roots. This allows the roots to breathe and facilitates better nutrient absorption. Additionally, biochar helps to loosen compacted soil, improving drainage and root penetration. The improved soil structure promotes healthy root development and reduces the risk of root diseases.

Long-Term Soil Health and Sustainability:

  • Biochar soil is a sustainable choice for gardening and houseplant care. Biochar enhances soil health over time by increasing organic matter content and improving microbial activity.

Carbon Sequestration:

  • Biochar is a remarkable carbon sink, as it sequesters carbon in the soil for hundreds or even thousands of years. By incorporating biochar into the soil, gardeners can contribute to mitigating climate change by effectively storing carbon and reducing greenhouse gas emissions.

Pollution Remediation:

  • Biochar has shown promise in mitigating soil pollution. Its high adsorption capacity can bind and immobilize heavy metals and other contaminants, reducing their availability for uptake by plants. This application is particularly valuable for contaminated urban soils or areas affected by industrial activities.

Waste Management:

  • Biochar provides a sustainable solution for the management of organic waste materials. By converting agricultural residues, crop residues, or wood waste into biochar, we not only reduce waste going to landfills but also transform it into a valuable resource for soil improvement.

Mother: Living Potting Soil

Imagine a potting soil that goes beyond basic nutrients and fosters a thriving ecosystem within your plant's root zone. Introducing "Mother" by PlantHero, a living potting soil that embraces the power of beneficial microorganisms to create an optimal environment for plant growth.

Mother is biochar based and designed for long-term plant health. The ingredients in the potting soil foster a nutrient-rich and well-structured soil to enhance your plant’s roots and overall health of your plants. The biochar in this soil gives it a deep, lustrous hue, enhancing the vibrancy of your plant's greenery.

This soil is suitable for a wide range of plants, encompassing both indoor and outdoor varieties such as aroids, trees, succulents, and seedlings.


Biochar has revolutionized sustainable agriculture and gardening practices by offering a multitude of benefits for plant health and growth. Its ability to enhance nutrient retention, improve soil structure and aeration, increase water-holding capacity, regulate pH levels, and sequester carbon makes it an invaluable addition to any planting endeavor. By harnessing the

power of biochar, we can create healthier, more resilient plants while promoting sustainable land management and combating climate change.

If you have any more questions about biochar and how it can benefit your plants or any other plant questions, we will be happy to assist you in a virtual telehealth appointment with one of our Plant Specialists. Please click on one of the options below to book an appointment.


bottom of page