In order to evaluate the effects of different concentrations of gibberellic acid and vermicompost on some morphological and biochemical characteristics of daffodil (Narcissus tazetta L.) an experiment was conducted as factorial based on completely randomized design in greenhouse conditions. The first factor was vermicompost at 4 levels: 0 (control), 10%, 15% and 20% V/V. The second factor was gibberellic acid applied at 3 concentrations: 0 (control), 150 and 300 mg L^-1 by soaking bulbs for 48 hours. The results showed that compared to the control, the effect of gibberellic acid and vermicompost decreased the time of flowering by 12.66 days, though increased flower pedicel and diameter by 26.3 and 0.83 mm, respectively and flower longevity by 8.66 day. Also, leaf fresh and dry weight increased by 7.33 and 0.31 g, respectively, leaf calcium 0.98%, flower relative fresh weight on days 3^rd, 5^th, and 7^th by 6.39%, 7.59% and 19.17% respectively. Chlorophyll a, b and total also increased by 0.51, 0.94 and 1.46 mg g^-1 FW respectively. In general, it can be stated that the simultaneous application of gibberellic acid and vermicompost was effective in improving all measured traits of Narcissus tazetta. Vermicompost 20% V/V and gibberellic acid 300 mg L^-1 showed the best results.