Soil cells are made so that they can be filled with any soil. This means that you can use any soil suitable for your project in the soil cells without any problems. Soil specifications are not only tailored to tree requirements, but also depend on project goals, climate zone, availability of groundwater, etc.
But also other factors such as durability, availability, the presence or absence of an irrigation system can be taken into account in determining the best soil for your project. Please feel free to ask one of our soil specilist to assist you on this topic.