A field experimental study was carried out during the two successive seasons of 2015/2016 and 2016/2017 to evaluate the effect of GA3 at (control, 100, 200 and 300 mg/L) and kinetin at (control, 25, 50 and 75 mg/L) on growth, flowering and chemical composition of Dendranthema grandiflorum kitam cv. Art Queen plants. The obtained data showed that: All GA3 and kinetin concentrations increased plant height, especially GA3 at 300 mg/L in both seasons. On contrary, all applied treatments of GA3 significantly decreased stem diameter to reach its maximum reduction with the highest concentration. While, the thickest stem was scored by the highest concentration of kinetin in the two seasons. The highest number of branches and leaves / plant as well as the heaviest fresh and dry weights of leaves/plant were gained by 75 mg/L kinetin-sprayed plants in the two seasons. Also, all tested GA3 and kinetin treatments succeeded in increasing flowers number / plant, fresh and dry weights of flowering head as well as flower vase life, with the superiority for kinetin at 75 mg/L in the two seasons.
Furthermore, GA3 and kinetin treatments increased leaf N, P, K, total carbohydrates, total chlorophylls and total indols contents, they decreased leaf total phenols content as compared with un-sprayed plants in the two seasons. However, the greatest leaves N, P, K, total carbohydrates, total chlorophylls and total indols contents were registered by the highest concentration of kinetin in the two seasons. Foliar application of kinetin at 75 mg/L was the best and ecomomic treatment which we can be recommend for almost growth and flowering characteristics of Dendranthema grandiflorum kitam cv. Art Queen plants.