It is very important to provide effective solutions to control the salinity stress in ornamental plants due to the increase of unpredictable climate changes and salin soil in different parts of the earth. Therefore, the effects of salinity (combination of sodium chloride and calcium chloride 100, 200, and 500 mM) and silicon (250 mg L-1 nanosilicon and 250 mg L-1 potassium silicate) were investigated on Rosa damacena plants under controlled glass greenhouse condition as a completely randomized design. Some leaf physiological responses (ion leakage, relative water content), proline level and activity of antioxidant enzymes such as catalase (CAT), peroxidase (POX) and ascorbate peroxidase (APX) were evaluated. The results showed that nanosilicon and potassium silicate prevented ion leakage caused by salinity compared to the control. Additionally, the relative water content was maintained to a large extent in response to silicon and nanosilicon. Silicon and nanosilicon also increased the proline content in the leaf, but this effect was more significant under salinity stress conditions, indicating a close relationship between salinity stress and silicon. In general, the resistance to salinity stress in Rosa × damascena appeared to be controlled by non-enzymatic mechanisms, as the application of silicon and nanosilicon under saline conditions had a synergistic effect in increasing the activity of the antioxidant enzymes catalase, peroxidase, and ascorbate peroxidase.