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)


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  • September 1st - meeting Product Group Mineral wool
  • September 13th - meeting Product Group Compost
  • October 6, 13 and November 3, 10, 17, 24 and December 1, 8 - course Growing Media B (Dutch)
  • October 7th - meeting Product Group Peat
  • October 11th - meeting Product Group Landscaping
  • October 12th - meeting Product Group Coir products
  • October 13th - meeting Product Group Organic products
  • October 14th - meeting Product Group Mineral products
  • October 21st - meeting Product Group End products Horticulture
  • November 18th - meeting Technical Committee
  • November 22, 29 and December 6 - basic course Potting soil and Substrates (Dutch)
  • November 25th - 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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