Agricultural Information:

Family: Brassicaceae
Scientific name: Brassica juncea

Mustard is a plant grown for both its seeds and leaves eaten as mustard greens. When the seeds are ground and mixed with water or vinegar, they create the condiment commonly known as prepared mustard. There are many vegetables cultivated as different varieties of the mustard plant including arugula, radish, wasabi, broccoli, brussel sprouts, cauliflower, choi, collards, kale, kohlrabi, rutabaga, and turnip.

Historical Information:

Mustard is mentioned in the Torah as being used to prepare the meat that Avraham served to the angels

Halachic Information:

Kitnyot
Kilayim