'Seeds' in the Bible

It is the smallest of all seeds, and yet when full-grown it is larger than any herb and forms a tree, so that the birds come and build in its branches."

It is like a mustard-seed, which, when sown in the earth, is the smallest of all the seeds in the world;

(Now the promises were given to Abraham and to his seed. God did not say 'and to seeds,' as if speaking of many, but 'and to your seed,' since He spoke of only one--and this is Christ.)