Agriculture is the planting and replanting of the seed, tilling the soil, watering, then harvesting.
Obviously, there were wild grains long before agriculture, and still are. Those were harvested for food.
Most likely the early grains were prepared as bulgar (boiled and mashed) before more advanced milling equipment (i.e. flat rock) was discovered or built.
“Obviously, there were wild grains long before agriculture, and still are. Those were harvested for food.”
That matches what a British documentary I watched recently reported. First hunter-gatherers. Then, over 12,000 years ago they supplemented meat with wild grains. Grain had the added benefit that it did not spoil like meat so it supported their nomadic lifestyle.
Of interest is the megafauna die off was around 12,000 years ago. This likely forced the transition of hunter-gatherers who supplemented their diet with grains to full time farmers of grain. Combined with animal husbandry it provided a suitable replacement for hunting and gathering. They grew it all themselves out of necessity.
The documentary identified the area around the sea of Galilee as having been an early settlement of resident farmers. The grains found there were imported from the northeast. With the death of the megafauna the nomadic hunter gatherers were forced to settle and grown their own crops and maintain livestock.