Basil seeds come from a variant of basil known as sweet basil (Ocimum bascilicum), which is native to the tropical regions of Africa and Asia which is the plant commonly used to season foods. For this reason, the seeds are typically referred to as sweet basil seeds. They also go by many other names, including sabja and tukmaria seeds. They are oval shaped Basil seeds are completely black and tear-shaped when dry, roughly the same size as chia seeds and swell up when soaked in water, producing a gelatinous mass.Basil seeds are high in fiber, a good source of minerals, rich in plant-based omega-3 fat, and plentiful in beneficial plant compounds. Basil seed beverages have long been popular in India and Southeast Asia and are now catching on in the United States as well. The main countries producing basil seeds are Pakistan, Afghanistan, India and Iran.