A field experiment was conducted in a greenhouse in the Al-Hussayniya district of Karbala Governorate during the fall of 2025 (July 15 to October 15, 2025). The objective was to investigate the effects of salinity concentrations (4251, 7855, 12090 mg L⁻¹) and oil residue contamination (black oil) concentrations (0, 30, 60, 90 g kg⁻¹) of desalination wastewater collected from a seawater desalination plant within the study area on the nickel (Ni) and lead (Pb) removal efficiency from contaminated soil using Sarconia species (ICBA-10 classification), as well as on the phytochemical components, yield, and quality characteristics of the plants. The experiment was conducted using a 3-replica fully randomized block design (RCBD). The experimental results revealed that the highest concentration of wastewater (12090 mg L⁻¹) demonstrated the highest efficiency in removing nickel (Ni) and lead (Pb) from contaminated soil. From the results obtained in this study, it was seen that the maximum level of soil oil contamination (90 g/kg) was associated with the rates of removal for nickel (41.2%) and lead (44.8%). In contrast, the minimum level of wastewater contamination (4251 mg L⁻¹) gave the maximum values for all investigated parameters of the plant. With an increase in the level of soil oil contamination, there was an observed decrease in plant height, fresh weight, grain yield, protein content, and oil content.