Donald Wyman (1904 — 6 December 1993) was an American horticulturist, the head of horticulture at Harvard University's Arnold Arboretum from 1935 to 1970.
He joined the Arboretum in 1935 and served for six months without salary in the depths of the Great Depression before being named horticulturist in 1936.
[1] He was the author of many books, including Wyman's Gardening Encyclopedia (1971) and was a frequent contributor to the journal Arnoldia.
[2] Wyman served as president, director, and trustee of the American Horticultural Society.
At the Arnold Arboretum he departed from the original method of planting by botanical association, to mark vistas and turns with specimen trees, and was energetic in acquiring seeds of many species that he introduced to American horticulture.