Soil Vault Systems

Stratavault by Citygreen is a modular soil cell system engineered to support urban tree growth while preserving the structural integrity of surrounding infrastructure. Made entirely from 100% recycled plastic—including ocean-sourced materials through a partnership with the Ocean Legacy Foundation—it exemplifies circular economy manufacturing in North America and Australia. Stratavault replaces traditional structural soil, offering up to 93% of the soil volume trees need to thrive, while preventing root damage to pavements and underground services. Its open skeletal matrix allows for easy on-site customization, eliminating the need for pre-cutting around utilities. Trees planted with Stratavault grow faster, sequester more carbon, and develop climate-resilient root systems, helping cities achieve net-zero goals and mitigate urban heat island effects more efficiently. The system also integrates with Citygreen’s Strataflow stormwater solution, enabling passive irrigation and reducing maintenance demands. Stratavault is HS20 load-compliant, making it suitable for installation beneath roads and sidewalks, and is undergoing third-party environmental certification to validate its sustainability claims.