The study of salinity stress in irrigated floriculture can make a significant contribution to the preservation of freshwater sources. To analyze the morphological and aesthetic responses of zinnia (Zinnia elegans L.) and periwinkle (Catharanthus roseus (L.) G. Don) to different salinity stress levels, the following treatments were performed: s0 = municipal water (control), s1 = 3 dS m−1, s2 = 4.5 dS m−1, and s3 = 6 dS m−1. The growth of zinnia (flower number, plant height, branch and leaf number, total fresh and dry biomass, and root length) was linearly reduced by increasing salinity levels, while all observed periwinkle traits for the s2 salinity treatment were either equal to or greater than the control treatment (n.s.) and a further increase in salinity stress showed a significant (p −1.
