Abstract: Light was found to be the most important factor affecting its seed germination. Under light conditions, soaking the seed for 30 min. in 50 ppm GA and 40°C hot water enhanced germination rate significantly. Under dark conditions, the seeds treated with KNO were the only ones germinating effectively. 3 The results suggest that Hypericum perforatum seeds exhibit both exogenous and endogenous dormancy. To over come former originating from a chemical inhibitor in exudate from capsule, washing with water, 40°C hot water and 50 ppm GA treatments; to over come later related with absence of light, 0.01 mol KNO3 treatment were recommended.