Water deficit in semi-arid areas is the main limiting factor affecting crop production and quality. Suitable strategies for water management, such as water regimes and grafting, can be helpful for the sustainability of agriculture and overcoming drought stress. Responses of two greenhouse-tomato cultivars (Durinta and Valouro F1) grafted onto three rootstocks (Beaufort, Maxifort, and Spirit) to water stress were evaluated using three irrigation water regimes (50, 75, and 100% crop evapotranspiration [ETc]