The meaning of Mustard in the Bible
(From Easton's Bible Dictionary)

a plant of the genus sinapis, a pod-bearing, shrub-like plant, growing wild, and also cultivated in gardens. The little round seeds were an emblem of any small insignificant object. It is not mentioned in the Old Testament; and in each of the three instances of its occurrence in the New Testament (Matthew 13:31,32; Mark 4:31,32; Luke 13:18,19) it is spoken of only with reference to the smallness of its seed. The common mustard of Palestine is the Sinapis nigra. This garden herb sometimes grows to a considerable height, so as to be spoken of as "a tree" as compared with garden herbs.

See more on the meaning of Mustard in the Bible:
Mustard {International Standard Bible Encyclopedia}

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