Abstract: The aim of this study was to examine whether Ferula gummosa seeds possess physical, physiological or combined dormancy. Seeds collected from Shahrekord zone in the center of Iran were subjected to different treatments. Dormancy breaking treatments were included: prechilling for 20, 30 and 40 days, exogenous application of GA3 (250, 500 and 1000 ppm), prechilling for 40 days combined with various levels of GA3 (250, 500, 1000 ppm), H2SO4 (80%) for 5 and 10 min, hot water at different temperatures (70 and 90°C) for 10 min, thiourea (3%) and KNO3 (0.3%) for 72 h. Germination of Ferula gummosa significantly increased at higher concentrations of GA3 (1000 ppm) and a longer period of prechilling treatments (for 40 days) and reached 41 and 69%, respectively. Consequently, these treatments were highly effective in dormancy breaking in comparison with other prechilling and GA3 treatments. The highest germination was observed when seeds were exposed to prechilling (for 40 days) combined with GA3 (1000 ppm) and induced up to 75% germination and suggested a synergistic response to GA3 and prechilling. Radicle and plumule length, vigor index and Mean Germination Time (MGT) were also affected through treatments. Thiourea (3%), KNO3 (0.3%) and 90°C hot water for 10 min had no effect on germination and other traits. Germination rate was positively correlated with germination percentage. These results showed that Ferula gummosa seeds exhibit both exogenous and endogenous dormancy.