1803 The Louisiana Purchase Timelines: Timeline of American Garden History
The Louisiana Purchase of 1803 doubles the land area of the United States and officially opens “the West” for settlement. As settlers from Europe pour into the United States, so too did their seeds, plants, and gardening styles.
Phyllis Anderson, et al. Keeping Eden: A History of Gardening in America. Edited by Punch, Walter T., (Boston: Bullfinch Press, 1992.)