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?


  • September 20th - German-speaking workshop "What is in the pores; water of air?"
  • September 27th - meeting Working Group Hygiene
  • September 28th - meeting Product Group Fertilizers and Lime
  • September 29th - meeting Product Group Organic Products
  • Octobre 6th - meeting Product Group Peat
  • Octobre 25th - meeting Product Group Compost
  • Octobre 25th - meeting Steering Committee Research
  • November 3rd - meeting Technical Commission
  • November 24th - meeting Central College of Experts
  • December 13th - meeting Product Group Coir
  • December 13th - meeting Product Group End products
  • 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

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