- John I, King of Portugal, 1357-1433
- John IV, King of Portugal, 1604-1656
- John R. Spelman Co.
- John R. Taft (Firm)
- John R. Watts & Son.
- John Robertson's Nurseries.
- John Robertson's Nursery.
- John S. Calkins (Firm)
- John S. Kerr (Firm)
- John S. Kerr Nursery Company.
- John S. Pearce & Co.
- John S. Weaver (Firm)
- John Saul (Firm : Washington, D.C.)
- John Scheepers, Inc.
- John Siebenthaler Nurseries.
- John U. Kumerle & Son's.
- John Vermeulen & Son.
- John Vermeulen (Firm)
- John von Johnesberg, Conrad Heinrich, 1852-1918
- John W. Finn's Wholesale Nurseries.
- John W. Hanna (Firm)
- John W. Hershey (Firm)
- John W. Hershey Nurseries.
- John W. MacIntyre (Firm)
- John W. Merritt, (Firm)
- John W. Moore Company.
- John Waterer, Sons & Crisp.
- John Wilk & Co.
- John Wilk & Co.,
- John Wilk (Firm)
- John Wilson and Son.
- John Zazo Nurseries.
- John, Ashish Joshia Ingty
- John, D Dilwyn 1901-1995
- John, David M
- John, E
- John, Eddie
- John, George M
- John, Hans
- John, Jacob
- John, Jason R M
- John, Joji
- John, K O
- John, K. W.,
- John, Kenneth R
- John, Kurt
- John, Mathew C
- John, P A
- John, R
- John, Robert
- John, Roy
- John, Sajan
- John, Singh A J
- John, T Mathew
- John, Václav
- John. W. Hall (Firm)
- Johnburke
- Johnen, A. G. (Anna Gisela), 1925-2014
- Johns Hopkins Hospital.
- Johns Hopkins University.
- John's Plants Seeds Bulbs.
- Johns, Andrew D.
- Johns, Bette S
- Johns, Brian W
- Johns, C. A. (Charles Alexander), 1811-1874
- Johns, Chris
- Johns, John
- Johns, R J
- Johns, Stanley R
- Johns, Tony
- Johns, William, 1771-1845
- Johnsen, Sönke
- Johnsen, Stein
- Johnsgard, Paul A
- Johnsingh, A J T
- Johnson & Musser Seed Co.
- Johnson & Stokes
- Johnson Bros. (Barnegat, N.J.)
- Johnson Bros. (Bound Brook, N.J.),
- Johnson Cactus Gardens (Firm)
- Johnson Cactus Gardens.
- Johnson Musser Seed Co.
- Johnson Nurseries (Monticello, Fla.)
- Johnson Seed Co.
- Johnson Seed Co. (Philadelphia, Pennsylvania)
- Johnson Seed Company.
- Johnson Seed Potato Co.
- Johnson Seed Potato Company.
- Johnson Water Gardens.
- Johnson, A
- Johnson, A F
- Johnson, A Keith
- Johnson, A W
- Johnson, A. Campbell.
- Johnson, A. G.
- Johnson, A. H. (Arthur Henry), 1845-1927
- Johnson, A. J. (Alvin Jewett), 1827-1884
- Johnson, A. T. (Arthur Tysilio), 1873-1956
- Johnson, Adrian G
- Johnson, Albert
- Johnson, Albert G
- Johnson, Alfred
- Johnson, Alice
- Johnson, Amanda
- Johnson, Amy S
- Johnson, Andrés
- Johnson, Andrew J
- Johnson, Andrew L A
- Johnson, Andrew, 1808-1875
- Johnson, Angela
- Johnson, Ann E
- Johnson, Ann F
- Johnson, Anne 1928-
- Johnson, Anne C.
- Johnson, Archibald
- Johnson, Arthur Monrad, 1878-1943
- Johnson, Ashley L
- Johnson, Bankole A.
- Johnson, Barbara Lou.
- Johnson, Ben.
- Johnson, Benjamin
- Johnson, Brenda S
- Johnson, Brian D
- Johnson, Bruce R
- Johnson, Bryan R., 1956-
- Johnson, C
- Johnson, C R
- Johnson, C. (Curtis Millard), 1942-
- Johnson, C. E.
- Johnson, C. Pierpoint (Charles Pierpoint), 1893
- Johnson, Cecilia W.
- Johnson, Charles Annon, 1888-
- Johnson, Charles Ellis, 1857-1926
- Johnson, Charles Eugene
- Johnson, Charles F
- Johnson, Charles F.
- Johnson, Charles G.
- Johnson, Charles L
- Johnson, Charles Willison, 1863-1932
- Johnson, Charles, 1791-1880
- Johnson, Charles, 1845-
- Johnson, Chas. L. (Charles Leslie), 1876-1950
- Johnson, Chester.
- Johnson, Christine
- Johnson, Christopher.
- Johnson, Clarence D., 1931-
- Johnson, Claudia C
- Johnson, Clifford D.
- Johnson, Clifford Ray
- Johnson, Clifton, 1865-1940
- Johnson, Colin
- Johnson, Craig W. (Craig William), 1941-
- Johnson, Cuthbert W. (Cuthbert William), 1799-1878
- Johnson, D
- Johnson, D A
- Johnson, D E
- Johnson, D Elmer
- Johnson, D H
- Johnson, D S
- Johnson, Dale E.
- Johnson, Dan
- Johnson, Daniel, 1767-1835
- Johnson, Darren D.
- Johnson, Dave
- Johnson, David L
- Johnson, David M.
- Johnson, David W
- Johnson, David W. (David Winslow), 1940-
- Johnson, David William, 1959-
- Johnson, Debbie
- Johnson, Dennis E. (Dennis Earl), 1942-
- Johnson, Dennis Victor, 1937-
- Johnson, Donald R
- Johnson, Donald W.
- Johnson, Dorothy A
- Johnson, Douglas
- Johnson, Douglas H
- Johnson, Douglas W.
- Johnson, Douglas Wilson
- Johnson, Duncan S. (Duncan Starr) 1867-1937
- Johnson, E D H
- Johnson, E. M. (Edward Marshall), 1896-
- Johnson, E. O.
- Johnson, E. R.
- Johnson, E. R. (Ernest Reuben), 1892-
- Johnson, Eden
- Johnson, Edna L
- Johnson, Edward Arnold, 1943-
- Johnson, Edward C. (Edward Carl), 1880-
- Johnson, Edward Gilpin.
- Johnson, Edward, Sir, 1785-1862
- Johnson, Edwin A., 1829-
- Johnson, Edwin R. (Edwin Roy), 1881-
- Johnson, Eileen McAllister
- Johnson, Eileen Ruth Laithlain, 1896-1972
- Johnson, Elizabeth Z.
- Johnson, Elmer.
- Johnson, Emily
- Johnson, Emma B., Mrs.
- Johnson, Eric
- Johnson, Eric V
- Johnson, Erik I
- Johnson, Erin K
- Johnson, Ernest W., 1904-2014
- Johnson, Ethan W.
- Johnson, Ethelbert, 1896-1977
- Johnson, Ezekiel Porter, 1798-1865
- Johnson, F. Walker.
- Johnson, Florence
- Johnson, Floyd A. (Floyd Alfred), 1911-
- Johnson, Forrest
- Johnson, Frank C., entomologist.
- Johnson, Frank H. (Frank Harris), 1908-1990
- Johnson, Frank Holmes
- Johnson, Frank Mackie.
- Johnson, Fred
- Johnson, Fred
- Johnson, Freddie Allen, 1938-
- Johnson, Frederic D. (Frederic Duane), 1925-2014
- Johnson, G C
- Johnson, G I
- Johnson, G L
- Johnson, G T
- Johnson, G. A. L. (George Anthony Lobjoit)
- Johnson, G. David
- Johnson, G. F.
- Johnson, G. G.
- Johnson, G. Lindsay (George Lindsay), 1853-
- Johnson, G. V.
- Johnson, Gabriel
- Johnson, Gary
- Johnson, George B
- Johnson, George Edwin
- Johnson, George H.
- Johnson, George Pryor
- Johnson, George Thomas
- Johnson, George William, 1802-1886
- Johnson, George, 1837-1911
- Johnson, George, 1903-1980
- Johnson, Gerald H
- Johnson, Gerald L.
- Johnson, Giff
- Johnson, Gilbert E
- Johnson, Gillian M
- Johnson, Glen
- Johnson, Grace Pettis.
- Johnson, Greg
- Johnson, H B
- Johnson, H P
- Johnson, H. C. (Ornithologist)