This research was conducted to evaluate the possibility using zeolite as appropriate medium in the cultivation of ornamental plants by a completely randomized design in three replications in Export Terminal of Plant and Flower, Salmanshahr, Mazandaran, Iran. A 2:1 ratio of peat to perlite and peat was used as control treatment and peat was replaced by 10, 20, 30, 40 and 50% v/v of zeolite in two methods: 1. treatments with nutrient solution and 2. treatments without nutrient solution. Growth indexes include height, leaves number, stem diameter, dry weights of leaf were measured in Dieffenbachia plant. Nutrients concentration of nitrogen, phosphorus and potassium in leaf were also measured. Results showed that nutrient solution had a considerable effect on plant growth in all treatments than without nutrient solution. Zeolite decreased the plant growth without nutrient solution, but when it is used with nutrient solution caused to increases leaf number and stem diameter than in the control.
