Grasses are increasingly popular plants in urban plantings. Their popularity is due to the widely available range of species and varieties and their high resistance to urban conditions. One of the new cultivars of Miscanthus sinensis 'Gold Bar', which was used in this study, belongs to this group. Plants originating from in vitro cultures, grown in peat medium, were treated with aqueous NaCl solution in three concentrations: 50, 150 and 300 mM · l-1. In order to determine the changes that occur as a result of the stress factor, biometric measurements of the above- and below-ground parts of the plants were made, and biochemical analyses for hydrogen peroxide content and catalase activity were performed. In the course of individual measurements and analyses, it was observed that the highest concentration of NaCl caused in the plants studied, first of all, a 3-fold reduction in the length of the root system in relation to the control plants; additionally, a strong dieback of leaves was observed. The results obtained during the experiment prove that resistance to salinity stress is strongly correlated with cultivar. In addition, these studies provide a basis for the use of this cultivar in the city, but away from areas heavily polluted with salt compounds.