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 27 - meeting Product Group Compost
  • September 28 - meeting Supervisory Board
  • October 3, 10, 24 and 31, November 7, 14, 21 and 28 - course Growing Media A (English)
  • October 5 - meeting Responsibly Produced Coir (for participating coir companies)
  • October 9 - meeting Product Group Mineral products
  • October 12 - meeting Product Group Fertilisers and lime
  • October 13 - meeting Product Group Peat
  • October 25 - meeting Product Group Organic Products
  • November 1 - online workshop 'Volume determination of plugs' 
  • November 2 - meeting Product Group RAG Landscaping and RAG Soil improvement
  • November 2 - meeting Product Group Mineral wool
  • November 3 - meeting Product Group Horticulture
  • November 7 - meeting Product Group Mushrooms
  • November 9 - meeting Product Group Coir
  • December 1 - meeting Technical Committee
  • December 7 - hybrid meeting for certified companies
  • December 14 - meeting Supervisory Board
  • December 15 - meeting Central Board of Experts
  • December 19 - meeting Development Committee Plugs

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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