One vital area of research about medicinal plants is to study the different environmental conditions affecting the quality of these plants. Also in the research of medicinal plants, it is necessary to investigate and find the optimal conditions to produce the plants with the highest possible yield. Knowing the proper planting date of medicinal plants for each region can be effective in increasing the yield. Cultivation date is one of the main factors in determining the yield of black seed. Accordingly, in different regions, different times have been suggested for the cultivation of this plant. On the other hand, due to the environmental problems caused by the use of chemical fertilizers, the use of organic fertilizers can be used as a solution to increase the yield of medicinal plants. Therefore, vermicomposting can increase yield by improving the condition of the soil bed.