c. 1770, January 30
It is generally believed that 1770 was the year that rhubarb was introduced into the United States. and that first shipment of rhubarb was sent by Benjamin Franklin.
Franklin was at the time living in London and shipped a crate of rhubarb to Philadelphia to his friend, John Bartram, the preeminent botanist of his time. It was not for another 60 years that the root gained popularity in the US..