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 securtiy that the substrate meets the right quality requirements for water and air content, pH and for example EC. It also offers more security that the substrate is pure and 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.
Watch video: RHP quality mark for substrates


current NEWS ABOUT substrates, SOIl Research and workshops

Always our latest news in your mailbox?


  • September 27th - meeting Working Group Hygiene protocol substrate companies
  • September 27th - meeting Product Group Fertilizers and lime
  • November 2nd - meeting Product Group Peat
  • November 16th - meeting Product Group Organic products
  • November 30th - meeting Technical Commission
  • December 6th - meeting Product Group End products Horticulture
  • January 21st 2019 - meeting Product Group Coir
  • April 9th 2019 - meeting Product Group Mineral Products

Facts & Figures

The knowledge center for substrates in Europe

Quality 100%
PRODUCT analyses 10.426
9200K 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