Where does grass seed come from?

Grass seed comes from grasses that have been able to flower and produce seed. Yes grass flowers and produces seed just like your average garden and flower-bed plants are able to. Corn is a grass, and we commonly let it grow big enough to generate seeds (which are also called kernels) which we eat. When grass flowers, a stem erupts from the base of the grass plant and elongates, and at the top of this stem emerges a green seed-head. The way these grasses flower is by releasing anthers which, like "normal" flowers, are the male parts that spread their pollen to other seed heads or provide pollen to pollinate the stoma within the individual inflourescence (or flowering structure). After the period of flowering is complete, the seeds harden and turn to a golden color. Wheat, barley and rye are grasses as well, and have the same physiological abilities as wilder grasses do. Once the seeds are hard, they are ready to be harvested, either by hand or by animals who help spread the seeds on the ground to different areas.

You can purchase grass seed by the bushel in sacks at your local garden store or at a seed specialist.