The genus Spiraea is a perennial shrub belonging to the Rosaceae family and is a plant native to Korea that grows throughout the Korean peninsula. Plants of this genus are important resources with ornamental and medicinal value. Here, we collected the seeds of S. prunifolia, S. salicifolia, and S. chinensis and investigated their dormancy and germination characteristics. The seed lengths of S. prunifolia, S. salicifolia, and S. chinensis were approximately 2.21, 2.86, and 2.01 mm, respectively. S. prunifolia reached maximum germination rates of 100%, 100%, 100%, and 58.2% at 25/15, 20/10, 15/6, and 5°C, respectively, within 5 weeks under alternating temperature conditions. In the cold stratification experiment at 5°C, germination rates were also high in all stratification treatments, reaching 100%, 93.3%, 90.2%, and 84.4% at 0, 4, 8, and 12 weeks, respectively. In S. chinensis, the same pattern was observed in all treatments under variable temperature conditions, reaching the maximum germination rate (100%) within 5 weeks, and the germination rates were high in all treatments at 100%, 100%, 90.6%, and 90.6% at 0, 4, 8, and 12 weeks, respectively. There was no significant difference according to the concentration of GA3. However, S. salicifolia had very low germination rates of 14.0%, 16.5%, and 5% at the temperatures of 25/15, 20/10, and 15/6°C, respectively, after 5 weeks. At 20 weeks after treatment, the germination rate improved to over 50% in the relatively cold treatments of 15/6 and 20/10°C. In addition, the germination rate improved through GA3 treatment. Therefore, among the three species of Spiraea plants, S. prunifolia and S. chinensis are judged not to exhibit dormancy, and S. salicifolia is classified as exhibiting physiological dormancy, which is judged to specifically involve non-deep dormancy.