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 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?


  • June 28th - meeting Central College of Experts
  • September 19th - meeting Product Group Mineral wool
  • October 11th - meeting Product Group Horticulture
  • October 15th - meeting Product Group Organic products
  • October 16th - meeting Product Group Coir products
  • October 29th - meeting Product Group Mineral products
  • November 8th - meeting Technical Commission
  • November 21st - meeting for certified companies
  • January 24th 2020 - meeting Product Group Landscaping

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