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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  • March 14, 21 and 28, April 4, 11 and 18 - course Growing Media A (Dutch) 
  • March 23rd - meeting Supervisory Board
  • March 23rd - meeting Product Group RAG Landscaping / RAG Soil supply
  • March 23rd - meeting Product Group Mineral products
  • March 29th - meeting Product Group Compost
  • March 30th - training and harmonisation day for auditors
  • April 6th - meeting Product Group Fertilisers and Lime
  • April 12th - Knowledge Day Substrate 2023 (Dutch)
  • April 14th - meeting Product Group Peat
  • April 19th - meeting Product Group Organic products
  • April 21st - meeting Product Group Endproducts Horticulture
  • June 2nd - meeting Technical Committee
  • June 30th - meeting Central Board of Experts
  • October 3, 10, 24 and 31, November 7, 14, 21 and 28 - course Growing Media A (English)
  • November 17th - meeting Technical Committee
  • December 8th - meeting Central Board of Experts

Facts & Figures

The knowledge center for substrates in Europe

Quality 100%
PRODUCT analyses 14.592
9999K 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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