The Hawita-Fruhstorfer roof garden and troger soil is a high-quality special substrate, which provides a green roof and is also used as a plant substrate for filling large-volume planters / troughs for perennials, conifers and deciduous trees. The soil ist also suitable as lawn support layer. Due to the high proportion of expanded clay and lava, Hawita Fruhstorfer roof garden and trough soil prevents compaction of the soil. In addition, the mineral components for an optimal drainage effect and aeration of the roots. The volcanic clay act as a perfect nutrient and water reservoir.