Greener cities start here:
How biochar boosts urban tree health

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The sponge city concept

The Stockholm method with biochar contributes to the sponge city of the future and improves climate adaptation measures in cities, e.g. for green roofs and facade greening. In addition, biochar boosts urban tree health and improves soil quality.

Root spaces are expanded with skeleton soil (coarse gravel, 100-150 mm grain size) under paved surfaces or connected to natural root spaces.

The fine substrate of quartz sand, biochar and compost remains permanently permeable to air and water. Inlet shafts channel rainwater and support gas exchange. Additional root space can be used as a trench.

Impacts

  • Wind protection
  • Fine particle filter
  • Reduced noise level
  • Cooling
  • Shadowing
  • Tree stability
  • CO2 binding
  • Biodiversity
  • Rain water management

We offer the biochar for your sponge city concept

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Common stressors

  • Droughts, dryness
  • Heat waves
  • Diseases
  • Urbanization
  • Space restrictions
  • Lack of nutrients
  • Sealing, compaction
  • Salt pollution

Benefits with biochar

  • Water, nutrient and air storage
  • Less tree stress
  • Higher biodiversity
  • Reduced erosion
  • CO2 sink potential
  • Healthier trees

How biochar supports your urban tree project

Urban tree planting projects are critical for improving air quality, reducing urban heat islands, and enhancing biodiversity. When paired with biochar, these initiatives can go even further – significantly increasing the long-term storage of atmospheric carbon dioxide (CO₂).

In conclusion, biochar acts as both a carbon sink and a soil enhancer. When incorporated into tree planting efforts, it amplifies the carbon sequestration potential significantly.

Calculate the costs for your sponge city concept

Try out the Sponge City Calculator to find out how many years it will take for your urban tree project to pay off!

Just enter a few key details – like the cost of soil replacement, or the volume of your tree pit – the calculator will do the rest. It’s a simple way to see how your investment can save money over time while boosting climate resilience.

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