The Medal of Honor is awarded for outstanding service to horticulture.

The Medal of Honor is The Garden Club of America's oldest national award. It was first given to Charles Sprague Sargent, a Harvard University professor and the founding director of the Arnold Arboretum, in 1920, and endowed in 1963 by the Bedford Garden Club, Zone III, in memory of member Alice Mary Sloane Anderson (Mrs. Arthur Marvin Anderson: 1888–1961). The medal was designed in 1920 by sculptor John Flanagan who also designed the original US quarter dollar coin that was first issued in 1932.