Brown mustard (Brassica juncea), also called Indian mustard or Chinese mustard, produces small round seeds that range from dark yellow to brown-black. These seeds are hotter and more pungent than the milder yellow mustard seeds, with a sharp, nose-clearing heat that develops when the seeds are crushed or ground and mixed with liquid.
Brown mustard seeds are fundamental to Indian cooking, where they’re often the first ingredient in the pan — popped in hot oil until they splutter, releasing a nutty aroma. They’re also the primary ingredient in Dijon mustard and many whole-grain mustards. The plant’s leaves (mustard greens) are eaten as a vegetable in many Asian cuisines.
The mustard plant is also grown as an oilseed crop and as a biofumigant cover crop. Australia has a small but established mustard-growing industry, primarily in southern regions.
How it's produced
Brown mustard is grown as an annual crop in temperate climates, sown in spring or autumn depending on the region. The plants grow quickly, producing yellow flowers that develop into seed pods (siliques). When the pods begin to dry and turn brown, the crop is swathed or direct-harvested with a combine.
Timing is important — harvest too early and the seeds aren’t fully mature; too late and the pods shatter, scattering seeds on the ground. After harvest, seeds are cleaned, dried to a stable moisture content, and either sold whole or ground into mustard powder. In Australia, mustard is grown commercially in Victoria, South Australia, and parts of Western Australia, often in rotation with cereal crops.
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