Genesis 1:11: and God Said, "Let the earth bring forth grass, the herb yielding seed, and the fruit tree yielding fruit after his kind, whose seed is in itself, upon the earth: And it was so."
To make seed, a plant will send miles of root hairs down into the soil. The plant gathers large amounts of water; produces its own food, by growing leaves, and grows flowers, with stamens and pistils, that produce pollen. This pollen will be either transported by the wind or attracted to insects that will carry the pollen from flower to flower. All of this happens just to produce a seed!