Disclosed herein is a plant growth medium obtained by forming a mixture of a conventional powdery plant culture medium and a gel-formable material into a sheet and then solidifying the sheet or by forming a mixture of such a conventional culture medium, a gel-formable material and a water-holding material into a sheet, granules, pellets, tablets or powder and then solidifying the thus-formed mixture. By simply adding water to the plant growth medium and reconstituting same, the plant growth medium can be used for the germination, growth, transplantation, cutting and the like of a plant.