Abstract: A synthetic growing medium comprising a thorough mixture of urea formaldehyde foam granules, powdered humus, and a wetting agent. The medium also includes plant nutrients, trace elements, and pH adjusting material. The growing medium is prepared by grinding urea formaldehyde foam into granules having an average diameter of between 0.1 and 1.0 centimeter. Separately, humus, such as peat, is ground to a powder. A liquid wetting agent is sprayed onto the humus and thereafter the wetting agent-carrying humus powder is mixed with the foam granules. The proportion of foam to humus is within the range of 250 parts foam to one part humus to one part foam to five parts humus. At any appropriate time, nutrients, trace elements, and pH adjusting materials are added to the mixture.