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.
Watch video: RHP quality mark for substrates


current NEWS ABOUT substrates, SOIl Research and workshops

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  • Januari 11 and February 1, 8, 15, 22 and March 15 - course Growing Media B
  • March 21st - meeting Product Group Mineral wool
  • March 21st - meeting Steering committee Research
  • March 23rd - workshop 'Each PEAT is UNIQUE' (by invitation only)
  • March 28th - meeting Product Group Fertilizers and Lime
  • April 6th - meeting Product Group Peat
  • April 10th - meeting Product Group Mineral Products
  • April 19th - meeting Product Group Horticulture
  • May 15th - meeting Product Group Organic Products
  • May 30th - meeting Product Group Coir
  • June 1st - meeting Technical Commission
  • June 27th - meeting Central College of Experts
  • 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