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In this episode of Talking Trees, we explore the Stockholm Soil system—an innovative urban tree planting method designed to support healthy root development and infrastructure compatibility. This Swedish-engineered approach combines load-bearing stone aggregates with structured soil and biochar, enabling robust tree growth even under compacted urban surfaces like sidewalks and roads.

Topics discussed:

• What are Stockholm Soils? – A breakdown of the components: crushed rock, soil, geotextiles, and biochar, designed to allow root expansion and oxygenation while supporting surface loads.
  
  
• Urban challenges addressed – How this system prevents soil compaction, enhances stormwater management, and improves tree vitality.
  
  
• Installation and design – Key steps in constructing a Stockholm Soil tree pit, including layering techniques and drainage considerations.
  
  
• Benefits over traditional planting – Improved root aeration, better water infiltration, pollutant filtration, and longer tree lifespan in cities.
  
  
• Sustainable Drainage Systems (SuDS) – Integration with rainwater harvesting and urban flood mitigation strategies.

The Stockholm method represents a science-based, scalable solution to the challenge of growing large, healthy trees in dense urban environments. It’s transforming how cities plant, protect, and benefit from trees.

Background information:

• Designing tree pits with structural soils; the Stockholm method.pdf
• Planting_beds_in_Stockholm_2017.pdf
• tree-pits-with-structural-soils-practice-note-V1-4.pdf

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