A green roof is a unique environment that calls for a unique growing medium. Harrowden Turf's growing medium meets the needs of both the building and the plants. Its specially blended extensive green roof substrate is tested to the German FLL guidlines (2018) and provides the perfect base for establishing a green roof.

An extensive green roof needs to retain moisture to support the plants, whilst also remaining lightweight. Harrowden's green roof substrate is made from recycled materials giving a low-density, low-nutrient base with optimum water retention properties.

Also available in bulk bags.

  • Lower density growing medium for less weight loading on a building. Dry weight approx 0.95kg/l; saturated weight approx 1.3kg/l per bulk bag

  • Open structure does not compact and is free draining

  • Optimum water retention for plants to thrive yet not prone to waterlogging

  • Larger particles 0-14mm – will not silt up drains, settle or wash away in heavy rainfall

  • A blend of organic and mineral material minimises the potential losses due to soil oxidisation

  • Produced to FLL guidelines – approved for use on living roofs

Composition

70% mineral material
30% 10mm PAS 100 certified green compost

Coverage

Each bag will cover an area of 1m² to a depth of 25mm

Recommended depths

Biodiverse wildflower roof: 150mm
Sedum only roof: 60mm