Quality of            
Growing Media 

RHP has been the European knowledge centre for growing media since 1963 

RHP certified substrates provide an optimal start of the culture. With the RHP quality mark you increase the security that the substrate complies with the quality requirements concerning for instance water uptake, air content, pH, EC and nutrients. It also offers more security that the substrate is clean and that it can be used without risks for the culture. The RHP quality mark monitors the quality of growing media in the chain, from raw materials production until processing and delivery at the company of the user.


RHP Certified for Horticulture coir products, peat, growing media (to: all certified products)


current NEWS ABOUT substrates, SOIl Research and workshops

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  • September 19 - RHP Online Research Update (webinar for certified companies)
  • September 23 - meeting Supervisory Board
  • September 26 - meeting Product Group Fertilizers and lime
  • October 7 - meeting Product Group Mineral products
  • October 9 - meeting Product Group Coir
  • October 10 - meeting Product Group Mineral wool
  • October 23 - meeting Product Group Organic products
  • October 24 - meeting Product Group RAG Landscaping and RAG Soil improvement
  • October 30 - meeting Product Group Compost
  • November 5 - meeting Product Group Mushrooms
  • November 5, 12, 19, 26 and December 3, 10 - course Growing Media B (Dutch)
  • November 15 - meeting Product Group Endproducts Horticulture
  • November 29 - meeting Technical Committee
  • December 11 - meeting Supervisory Board
  • December 12 - hybrid meeting for certified companies
  • December 13 - meeting Central College of Experts

Facts & Figures

The knowledge center for substrates in Europe

Quality 100%
PRODUCT analyses 15.145
10.500K m³

Knowledge Base

The ins and outs of substrates: from WOK to respiration and from potting reference to pH

certified products

Raw materials and end products classified per field of application

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