In this study, teh effects of tihe different concentrations of the treated wasie water the plant growth been investigated, Lolium perenne L. (English grass) and Lolium italicum L. (italian grass) was used ihe experrimenial materia. Treated and unireated waste water mud in different concentrations belong io ihe Maltepe Military High School's waier treatmeni plant was appted to the experimenial plan group. And tap water was applied to control materiah.According to the rescarch it was foıınd taht treated water and mud inercasd plant grouth according to control materiah and paraleli to tihs it is also concluded that the quantitics of dry and fresh matters was increased.