Past Award of Merit Recipients
| 1976 | Mildred E. Mathias John E. Voight Pennsylvania Horticultural Society |
| 1977 | Hugh Steavenson |
| 1978 | Robert James Hilton Leslie Laking Joseph W. Oppe Henry Teuscher |
| 1979 | George Kelly Ruth Ashton Nelson Catherine Sweeney |
| 1980 | Rosalynn Carter Eugene E. Cline Richard A. Howard The Morton Arboretum |
| 1982 | Carlton B. Lees Russell J. Seibert |
| 1983 | Ernest B. Chew |
| 1984 | Geoffrey L. Rausch |
| 1985 | F. Raymond Brush |
| 1987 | Roy L. Taylor |
| 1988 | Myron Kimnach |
| 1990 | Carl A. Totemeier |
| 1991 | Ann Lyon Crammond |
| 1992 | Brian O. Mulligan Elizabeth Scholtz |
| 1993 | Robert Ornduff Freek Vrugtman |
| 1994 | Gurdon L. Tarbox, Jr. |
| 1995 | J. C. Raulston |
| 1996 | Peter H. Raven |
| 1997 | Elizabeth McClintock |
| 1998 | Charles A. Lewis C. W. Eliot Paine |
| 2000 | Dr. John Creech Dr. George Ware |
| 2001 | Dr. Charles Lamoureux |
| 2002 | Dr. Harrison Flint |
| 2003 | Dr. Edward R. Hasselkus |
| 2005 | Gregory Long |
| 2006 | Steven Timbrook |
| 2007 | Barbara Whitney Carr |
