Quality of            
Growing Media 

RHP has been the European knowledge centre for growing media since 1963 

RHP certified substrates guarantee an optimal start of the culture. The RHP quality mark guarantees that the substrate meets the right quality requirements for water and air content, pH and for example EC. It also guarantees that the substrate is pure and clean and that it can be used without risks for the culture. The RHP quality mark guarantees the quality of growing media in the chain, from raw materials production until processing and delivery at the company of the user.


current NEWS ABOUT substrates, SOIl Research and workshops

Always our latest news in your mailbox?


  • December 1st - meeting Central College of Experts
  • December 12th - meeting Product Group Compost
  • December 13th - meeting Product Group Coir
  • December 13th - meeting Product Group End products
  • December 15th - meeting Supervisory Board
  • Januari 11, 18 and February 1, 8, 15, 22 - course Growing Media B
  • January 12, 19 and February 2, 9, 16, 23 - course Growing Media A
  • March 21st - meeting Product Group Mineral wool
  • March 21st - meeting Steering committee Research
  • March 28th - meeting Product Group Fertilizers and Lime
  • September 27th - meeting Working Group Hygiene protocol substrate companies

Facts & Figures

The knowledge center for substrates in Europe

Quality 100%
Soil 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