How Stockholm Is Sprouting Healthy Trees From Concrete


The "Stockholm tree pit” model involves digging a pit and constructing a frame underground around an urban tree’s roots, then filling this pit with a mixture of soil and stone to both aerate and fertilize the soil while also allowing rain water to be collected. The circumference of select planted trees increased from 30 to 35 centimeters to 100 and 136 centimeters between 2004 and 2024, even surpassing that of trees without the tree pits that have been there for more than 80 years.

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