STANDARD TREE SUBSOIL MIX IN BULK BAGS
The Standard Tree Subsoil Mix is a specially formulated mineral-based growing medium designed for use beneath topsoil in tree planting schemes. This subsoil mix provides essential structural support and a balanced environment for root development, ensuring long-term tree health in both urban and landscaped environments. technical datasheet
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(Excl. VAT £16)
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Produced with carefully screened sandy loam or sandy clay materials, the mix maintains excellent drainage properties while allowing adequate moisture retention. Its low organic matter content helps prevent nutrient imbalances and excessive biological activity, making it ideal for establishing stable rooting zones below topsoil layers.
- Provides a stable, aerated foundation for deep root penetration and anchorage.
- Reduces the risk of waterlogging, ensuring adequate oxygen reaches the root zone
- Minimizes excessive microbial activity and nutrient leaching, promoting long-term soil stability.
- Allows root penetration
- Works seamlessly beneath approved topsoil to support layered planting systems.
- Meets BS 8601:2013 standards and is screened to remove large stones, debris, and harmful materials.
This substrate blend is currently undergoing independent laboratory analysis by STRI (Sports Turf Research Institute) to validate physical, chemical, and biological performance. Full test reports will be made available upon completion and can be provided to clients on request.
Moisture retentiveGrowing Medium
LightweightUK Green Roof Code of Best Practise
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Physical Properties Bulk Density When Oven Dried 1.30 – 1.45 g/cm³ Physical Properties Bulk Density at field capacity 1.45 – 1.65 g/cm³ Physical Properties Field capacity (% v/v) 25 – 30% Physical Properties Total porosity (%) 35 – 45% Physical Properties Porosity at field capacity (%) 10 – 15% Technical Properties Organic matter (% weight) 1.5 – 3.0% Technical Properties Electrical Conductivity (mS cm-1) 6.2 – 7.5 Technical Properties pH <0.5 mS/cm Technical Properties Phosphate (mgl-1) <10 mg/L Technical Properties Potassium (mg l-1) <150 mg/L Technical Properties Total nitrogen (%) <0.5%
