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二色胡枝子种子硬实性与种子形态差异有明显相关。黑色种子粒级大，千粒重高，种子硬实率达６０．０％，褐色种子粒级小，千粒重低，种子硬实率为２５．３９％。采用多种方法解除硬实效果表明，９０℃热水浸泡种子３０ｍｉｎ左右能起到解除硬实，提高发芽率的效果，硬实解除后黑色种子发芽率（９５．０％）高于褐色种子发芽率（８５．０％），初步认为，种子颜色差异是种子成熟度不同造成的，或者是色素在种皮中的堆积度不同造成的。
Hardness of Lespedeza bicolor seeds is obviously related to the difference of seed morphology. Black seed grain size, grain weight, high seed hard rate of 60.0%, brown seed grain size, grain weight is low, the seed hard rate of 25.39%. The results showed that the method of removing hardwood by a variety of methods showed that the soaking of seeds in hot water at 90 ℃ for 30min could relieve the hardwood and increase the germination rate. The germination rate of black seeds (95.0%) after hardwood was removed was higher than that of brown seeds .0%), preliminary believe that the seed color difference is caused by different seed maturity, or the accumulation of pigment in the seed coat caused by different degrees.