Mustard is one of the most ancient spices. It has 3 varieties namely black, brown and white. The black mustard plant normally grows to a height of 10 feet. Brown mustard is largely cultivated. Brown mustard plant produces tiny yellow colored flowers, which almost cover the plant. White mustard is the most mild among all the varieties of mustard. Mustard Seed has a fresh aroma and slightly biting flavor but when the seeds are dried they do give any fragrance.