1912 Plant Quarantine Act Timelines: Timeline of American Garden History
The Plant Quarantine Act goes into effect, restricting the importation of nursery stock, plants, and seeds from foreign countries to prevent the possible transmission of plant diseases and pests.
United States. The Plant quarantine act, August 20, 1912, as amended March 4, 1913, and March 4, 1917. [Washington: Govt. print. off., 1917).