This study was carried out in the Lath of Horticulture Department Nursery, College of Agriculture Engineering Sciences, Duhok University. Kurdistan region, Iraq, for the period from 5th 2024 to study the effect of different levels of Zn (0, 0.50, and 0.75) and different concentrations of BA (0.50, and 100) mgl-1 on some vegetative parameters of two cultivars of Zinnia plant. The results were as follows: The mean values showed that the largest plants (90.556 cm) were recorded in the Zinnia Lavonda cultivar. Also, the same cultivar shows the maximum number of branches, aerial fresh and dry weight, and total carotin reached (8.160, 213.194 g, 11.534 g, and 12.398), respectively. While another parameter such as number of leaves, number of internodes, leaf area, and total chlorophyll were observed in the Zinnia rosso scarlatta cultivar and gave the maximum results reached (23.284, 10.790, 19.206, and 30.561), respectively. Also, data reported in the same table reveal that number of leaves, number of branches, number of internodes, plant fresh and dry weight, leaf area (cm2), and finally total carotin increased significantly with a 50 mgl 1 concentration of BA for the Zinnia Lavanda cultivar (26.741, 9.296, 12.556, 259.054, 13.829, 24.489, and 14.798), respectively, compared to the control. Furthermore, the highest value of the number of leaves. About the three factors, the maximum plant height for two cultivars of Zinnia Lavanda and Zinnia rosso scarlatta), the higher values reached 101.411 cm when spraying the plant by 50 mgl-1 + 0.50% Zn and 96.622 cm at 0.50% Zn alone, respectively, than the control plants (77.856 and 77.356 cm), respectively, were obtained in two cultivars. While the number of leaves, number of branches, number of internodes, and leaf area (cm²) increased significantly compared to control and other treatments, the main value reached (30.889, 9.778, 15.222, and 33.230 cm²) respectively, when the Zinnia Lavanda cultivar was spraying with 100 mgl-1BA+ 0.50% Zn. Also, the plant fresh weight, plant dry weight, total chlorophyll, and total carotin give the height value reached (333.080, 15.680, 42.714, and 17.90), respectively, when the Zinnia Lavanda cultivar was spraying with 100 mgl-1BA+ 0.75% Zn.