Botany
International Peace Garden
On July 14, 1932, the International Peace Garden was dedicated, representing the peaceful relationship between the United States and Canada.
Cherry Trees Planted Along the Potomac
On March 27, 1912, US First Lady Helen Taft and wife of the Japanese ambassador Viscountess Chinda planted two Yoshina cherry trees on the northern bank of the Potomac River. The plantings were in celebration of the Japanese gift of 3,020 cherry trees to the US government.
11th International Botanical Congress
On August 23, 1969, the US Post Office issued a set of four stamps for the 11th International Botanical Congress (IBC).
Garden Flower Series
On May 15, 1993, the USPS issued the first installment in the Garden Flower Series, which would honor flowers that bloom in each of the four seasons.
The Peace Rose
On April 29, 1945, the Peace rose was made available for sale in the US.