Today one of the problems of grain separation is separation of grains according to biologically valuable characteristics (germination, growth force, germination energy of grains, their physical, biological and chemical parameters, the amount of protein, gluten, etc.). It is need to justify isolate grain with high biological value, and thereby increase the yield of varieties “Felicia” and “Viola”. In this paper, we considered such seed characteristic as variability. It was found that the physical properties and replacement of seeds in the spike (dimensional characteristics, mass, density) have a direct relationship. The backlogs for new studies were identified, and all the data obtained empirically were displayed in the final table and presented in detail in this article.