growing media for growing young plants
To make plugs and other small preformed growing media, granular materials can be composed in several ways. This can be done by gluing, pressing or covering with paper or plastic. Preformed media can also be made from rock wool or foam products.
With the RHP quality mark you increase the security that the plugs or other small preformed growing media comply with the quality requirements concerning for instance volume, dimensions, rootability, water buffer, velocity of water uptake and nutritional aspects. The determination for volume and dimensions has also been developed for the CEN (European Committee for Standards) in Brussels and European legislation. The standards not only concern maximum and minimum values, but are also strongly focused on uniformity. In addition, the plugs must meet the standard RHP quality mark requirements and are therefore free of contamination with heavy metals, radioactivity, harmful substances, weed seeds, plant and human pathogens, according to the standards. Together with producers and users, RHP continues to expand the set of standards in the future.
