By offering RAL Quality Assurance for Potting Soils, Gütegemeinschaft Substrate für Pflanzen e.V. has expanded its activities to include another key segment, soils for amateur growers. Consumers often find it hard to judge the quality of potting soils. The RAL quality mark identifies quality soils.
Potting soils are mixtures of the most diverse of suitable constituents, such as peat, clay, bark humus, substrate compost, sand as well as other organic and mineral materials.
The composition depends on the potting soil’s intended purpose. Each constituent has its own task. Potting soils should ensure that the plants are adequately supplied with air, water and minerals at all times. This applies to both indoor plants and outdoor container plants.