The Parable of the Growing Seed is found in the book of Mark, chapter 4, verses 26-29.

The parable is as follows: And he said, “The kingdom of God is as if a man should scatter seed on the ground. He sleeps and rises night and day, and the seed sprouts and grows; he knows not how. The earth produces by itself, first the blade, then the ear, then the full grain in the ear.

Jesus tells of a man who scatters seed on the ground and then allows nature to take its course.