How mustard seed is grown
A mustard seed can be as little as 1 millimeter across and yet close to half oil by weight.
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The short version
Mustard seed comes from three plants: black, brown and white mustard. The seeds are 1 to 2 millimeters across and can be nearly half oil by weight. Farmers in cool, temperate regions sow it as a specialty crop, and the plants flower for a few weeks before the seed is harvested and dried.
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Sow in cool, moist soil
Seeds germinate in eight to ten days when the soil is cold and damp. Mustard prefers temperate regions, and Canada and the northern United States are big growers.
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Flower and set seed
Buds appear about five weeks after seedlings emerge and the plant reaches full bloom a week or so later. A longer bloom gives a bigger seed yield.
85 to 95 days to maturity
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Cut and dry the crop
Growers harvest when the plant matures, then dry and clean the seed. The seed comes yellowish white to black depending on the plant, and the black seed is the smallest.
Worth repeating
- In South Asia the seeds are fried in oil until they pop before going into a dish.
- In 2021 Nepal grew the most mustard seed in the world, ahead of Russia and Canada.
Where it goes next
Mustard seed feeds 2 lines directly and reaches 3 things in total.
Further down the line
Keep walking
Sources
Cite this page: "How mustard seed is grown." Assembly Line, 2026-11-03. https://assemblyline.org/make/mustard-seed