I'm not sure which specific event you are referring to, as George Washington's interest in wheat was likely due to a combination of factors.
As a farmer and landowner in colonial Virginia, Washington grew various crops including tobacco, corn, and wheat. However, he recognized that growing tobacco, which was the main cash crop in Virginia at the time, had some drawbacks such as depleting soil nutrients and declining prices due to oversupply.
In contrast, wheat was a more sustainable and profitable crop to grow. It could be grown in rotation with other crops to maintain soil fertility and yield a higher return per acre than tobacco. Additionally, Washington believed that wheat production could help promote self-sufficiency and reduce dependence on imported goods.
Therefore, while there may have been specific events or circumstances that contributed to Washington's interest in wheat, it was primarily driven by his desire to improve agricultural practices and support economic growth in colonial Virginia.