Mustard Seed comes from two large Shrubs, Brassica Juncea (Brown Mustard) and Brassica Hirta (Yellow Mustard), native to Asia. Both plants produce bright yellow flowers that contain small round seeds. Mustard seeds can be traced to different areas of Europe and Asia with the white variety originating in the eastern Mediterranean regions, the brown from the foothills of the Himalayan Mountains, and the black from the Middle East.