Mustard seeds are the small round seeds of various mustard plants. The seeds are usually about 1 to 2 millimetres in diameter and may be colored from yellowish white to black.
They are important herbs in many regional foods and may come from one of three different plants: black mustard, brown Indian mustard, or white mustard.
Mustard seeds generally take three to ten days to germinate if placed under the proper conditions, which include a cold atmosphere and relatively moist soil. Mature mustard plants grow into shrubs.