Seed can have many definitions. When I think of seed being used any other way than as the reproductive structures in plants, I think of a new beginning. Many different types of seeds can be planted or "sown". They can be planted in the ground to produce food, they can be used to impregnate a woman to produce babies, or seeds can be planted in an individual or a group as an idea. Seeds represent the very beginning of all life that was produced sexually, including fruits, vegetables, grains, and animals (including mankind). I think that seeds are one of the most amazing things that happen in this world. It is hard to imagine that something as tiny as they are, can produce something as large as they do. With this in mind, I recommend that you read Mark 4:31, this is a famous parable about mustard seed and the kingdom of Heaven. Included below is a link to Mark 4. Luke 13 (verse 19) is also a link to the same metaphor in slightly different words, this link was included to demonstrate the importance of this metaphor/parable in the Bible.
Links to the Bible
