It serves as a vegetation layer to set up extensive “green roof” with minimal need for maintenance. Suitable for growing xerophilous plants with lower demands like sedum and sempervivum and other succulent plants. It consists of a mixture of zeolite, not crushed and the crushed expanded clay, peat and bark compost. It is suitable for single tracks thick vegetation layer 10 – 20 cm. Thanks to the content of zeolite, the substrate has high water capacity and good permeability