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.


RHP Certified for Horticulture coir products, peat, growing media (to: all certified products)


current NEWS ABOUT substrates, SOIl Research and workshops

Always our latest news in your mailbox?


  • October 5th - meeting Product Group Landscaping
  • October 14th - meeting Product group Coir products
  • October 21, 28 and November 4, 11, 18, 25 november and December 2, 9 - course Growing Media A (English, online)
  • October 22nd - meeting Product group Organic products
  • October 28th - meeting Product Group Mineral products
  • October 29th - meeting Product Group Peat
  • November 5th - meeting Product Group End products Horticulture
  • November 9th - Online Research Update (for certified companies)
  • November 12th - meeting Technical Committee 
  • December 3rd - meeting Central Board of Experts
  • February 3, 10, 17, 24 and March 10, 17, 24, 31 - course Growing Media A (Dutch, hybrid/online)
  • March 9th - meeting Product Group Mineral wool

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