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21.07.2025
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Do you want to strengthen your trees, improve the soil, and do something for the climate at the same time? Then the combination of biochar and worm compost is just what you need. In this article, you'll learn why this duo is so effective and how you can easily use it yourself. Please also note the basic information about the Topic: Fertilizing trees.
Let’s now take a closer look at the two materials:
Worm compost: Living fertilizer
Worm compost, also known as worm humus or vermicompost, is created by the digestion of organic waste by compost worms.
Strengths of worm compost:
- supplies the soil with valuable, humic-bound nutrients
- brings active microorganisms into the soil
- promotes a stable, crumbly soil structure
Its weakness is that its effect is not permanent. Nutrients can be leached out, and the microbes need a suitable habitat to remain permanently active. This is precisely where biochar can help.
Biochar: Sponge for nutrients and microbes
biochar is made from plant material such as wood or straw and has a porous structure with an enormous surface area.
Strengths of biochar:
- increases water retention capacity, especially in sandy and dry soils
- improves soil structure, especially in compacted soils
- increases the plant availability of phosphorus and mineral nitrogen
- reduces the availability of heavy metals in the soil
- promotes root growth
- supports humus formation
By itself, biochar is inert, like an empty house without inhabitants. Only when combined with microorganisms and nutrients does it come to life. And worm compost is ideal for this.
What makes the combination of worm compost and biochar so valuable?
When worm compost and biochar are combined, a kind of super complex is created:
- The worm compost provides microorganisms, plant-available nutrients, organic acids & enzymes and humic substances.
- And biochar can store these valuable components thanks to its enormous internal surface and make them available to plants in the long term.
- Microbes settle in the coal and form long-term ecosystems.
- Nutrients are buffered instead of being washed out, thus creating the conditions for a long-term fertilizing effect
- Soil life stabilizes at a higher level
How to use the power duo:
- Get high-quality organic biochar and live worm compost (ideally microbially active or homemade).
- Mix about 5–10 l of biochar with about 1 l of liquid worm tea per m² in a bucket.
- Let the mixture steep for at least 48 hours to allow microbes to settle and charge the charcoal.
- Bring the power duo to the tree. For new plantings, you can add the mixture directly to the planting hole. For existing trees, you can work it into the soil around the trunk.
Do you want more tree knowledge?
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Great idea, easy handling and everything from ordering to delivery.
Michael K.
