Faced with the environmental challenges posed by urbanization and climate change, innovative techniques are being adopted to support the health of urban green spaces. The City of Dijon in France has recently chosen to incorporate SOLER biochar as part of the beautification of the Monge-Bassuet axis, an initiative aimed at enhancing the durability of plantings and improving rainwater management.
Optimal integration of SOLER biochar
The City of Dijon aims to improve public spaces and enhance accessibility while increasing greenery and reducing impermeable surfaces in the “Bossuet” Square and the “Monge” Street. To support this effort, SOLER biochar has been integrated into planting areas by the ID Verde landscape team.
The choice focused on a locally sourced, sustainably produced biochar, with an optimal grain size to meet the needs of urban vegetation. This particle size provides excellent water filtration and retention capacity, creating a moist micro-environment around roots, which is crucial for the growth of trees and plants in the city center, thereby reducing water stress. As such, SOLER biochar becomes a true support for soil life and the surrounding vegetation.
Advantages of SOLER biochar:
- Great filtration and retention of rainwater
- Improvement of soil health
Co-benefits for the city and its green spaces
Thanks to the planting system and biochar incorporation, roots benefit from deep, aerated soil, promoting their development in symbiosis, which reduces sidewalk and roadway degradation where roots usually concentrate. At greater depths, roots are less susceptible to drought as the subsoil provides both water and oxygen, allowing young trees to survive and thrive.
The use of biochar in urban greening also helps combat heat islands. During high-temperature events in summer, daytime temperatures exceed 40°C, and remain at a minimum of 20°C at nighttime. These uncomfortable conditions for residents are caused by material choices, soil impermeability, and lack of green spaces. Applying SOLER biochar increases city vegetation, boosting the resilience and growth of green spaces and potentially reducing temperatures by 2 to 8°C (source: IdVerde).
It also lowers municipal water treatment costs by allowing rainwater to infiltrate directly into planting pits, reducing flood risks. Thus, biochar acts as a pre-treatment and rainwater purification method.
Using regional materials provides an additional, sustainable advantage for long-term urban planting platforms. The biochar in these beds is geologically stable, meaning it does not decompose as peat moss or compost substrates do.
Cobenefits of SOLER biochar:
- Prevention of sidewalk degradation
- Support for the survival and growth of young trees
- Mitigation of heat islands
- Cost optimization for wastewater treatment facilities
- Creation of sustainable planting beds
Promising results and a sustainable future for urban development
The integration of biochar in urban soils, as illustrated by the City of Dijon’s initiative, paves the way for environmentally respectful and innovative urban development solutions. By promoting the resilience of green spaces, conserving water resources, and reducing infrastructure costs, this approach embodies a bold, sustainable vision for the city of tomorrow. By choosing to revitalize its public space while respecting natural cycles, Dijon inspires a more harmonious urban model where nature and buildings complement each other to create more sustainable, pleasant cities for future generations. Next step for Dijon: planting 70 trees in the fall.
