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¹ Tokat Gaziosmanpasa University, Faculty of Agriculture, Department of Horticulture, 60250, Tokat, Türkiye DOI : 10.16882/HortiS.1900411 Viewed : 25 - Downloaded : 16 Zinc (Zn), an essential micronutrient, plays critical roles in plant growth and physiological regulation. In Helianthus annuus L., proper Zn management is necessary to support plant development and the quality parameters that affect commercial performance. However, studies that evaluate different zinc treatment methods and doses in this species simultaneously remain limited. This study was conducted to determine the effects of different Zn doses applied foliarly and through the soil, as well as combinations of these treatments, on growth, quality, and post-harvest performance in Helianthus annuus `Solano Orange Summer` F1. The experiment consisted of 18 predefined Zn treatment regimes (ZnSO4 7H2O, 20% Zn), including combined treatments representing practical Zn management strategies. Within the scope of the study, flower stem length, stem thickness, flower diameter, number of leaves, branch weight, SPAD value, harvest date, and vase life parameters were evaluated. Among the combined foliar and soil treatments, the highest stem length was obtained in the ZF₈+ZT_0.5 (8 mg L^-1 from foliar treatment + 0.5 mg L^-1 from soil treatment) treatment, while branch weight increased in the ZF₄+ZT_1.5 (4 mg L^-1 from foliar treatment + 1.5 mg L^-1 from soil treatment) treatment. Leaf number increased in the ZF₂+ZT_2.5 (2 mg L^-1 from foliar treatment + 2.5 mg L^-1 from soil treatment) treatment, whereas the earliest harvest and longest vase life were determined in the ZF₈+ZT_1.0 (8 mg L^-1 from foliar treatment + 1.0 mg L^-1 from soil treatment) treatment. The SPAD value was particularly high in the ZF8 treatment (8 mg L^-1 via foliar treatment). It was determined that all combined Zn treatments resulted in higher branch weight and leaf number compared to the control treatment. In conclusion, this study revealed that Zn treatments have different effects on growth, quality, and postharvest performance in cut ornamental sunflowers depending on the dose and application method. Keywords : Cut flower Helianthus annuus Micronutrient management SPAD value Vase life