- Greenville Nursery Co.
- Greenville Nursery Company.
- Greenwalt, Dale
- Greenway, Frank
- Greenway, Gordon H.
- Greenway, James C. (James Cowan), 1903-1989
- Greenway, Margaret
- Greenway, P.J
- Greenway, P.J.
- Greenway, Percy James, 1897-
- Greenwell, Phill
- Greenwell, Rose Agnes Sister
- Greenwell, William, 1820-1918
- Greenwich Bird Protective Society, Inc.
- Greenwood County Nursery.
- Greenwood Farm Nursery.
- Greenwood Farm.
- Greenwood Farms
- Greenwood Nurseries, Inc.
- Greenwood, A W
- Greenwood, Alex
- Greenwood, Charles L
- Greenwood, David Robert
- Greenwood, Dorothy F.
- Greenwood, Edward Warren 1918-2002
- Greenwood, Emery C.
- Greenwood, F.
- Greenwood, George, 1799-1875
- Greenwood, Hamilton 1955-
- Greenwood, Jack
- Greenwood, Jack G.
- Greenwood, James.
- Greenwood, Jeremy J D
- Greenwood, Laura.
- Greenwood, M
- Greenwood, Marjorie.
- Greenwood, Paul G
- Greenwood, Peter Humphry
- Greenwood, Raymond J.
- Greenwood, Richard
- Greenwood, Roberta S.
- Greenwood, Sarah
- Greenwood, Thomas, 1851-1908
- Greenwood, William
- Greenwood-Barton, L. H.
- Greenzaw, C B
- Greer, Allen E
- Greer, Donald L
- Greer, Elizabeth
- Greer, Gary K
- Greer, J. B.
- Greer, Jack,
- Greer, James R.
- Greer, Jeffrey E.
- Greer, Keith
- Greer, Kenneth R.
- Greer, Lee F
- Greer, Richard Earl.
- Greer, Rob Leon, 1876-
- Greer, Thomas 1874-1949
- Greer's Berry Gardens.
- Greeshma, P
- Greeson, Phillip E.
- Greeson, Tommy Darell.
- Greever's (Firm)
- Greever's Drug Store, Inc.
- Grefing, Lorentz Ludewig.
- Greg Siepen
- Greg, Robert Hyde, 1795-1875
- Greg, Thomas
- Greg, William Rathbone
- Gregati, Rafael Augusto
- Greger, Darling K.
- Greger, Justin
- Greger, Paul D
- Gregersen, Keld
- Gregersen, Kristian
- Gregg & Pease, Florists.
- Gregg Gardens.
- Gregg, Bobibt E
- Gregg, Clifford C., 1895-1992
- Gregg, David
- Gregg, Edward J.
- Gregg, James H
- Gregg, John R
- Gregg, Josiah, 1806-1850
- Gregg, Kenneth W
- Gregg, Michael A
- Gregg, Robert E. (Robert Edmond), 1912-1991
- Gregg, Robert Edmond, 1912-1991
- Gregg, S. A.
- Gregg, Thomas.
- Gregg, W. H.
- Gregg, Wendell O
- Gregg, William H.
- Grego, Christiana Kelly da Silva
- Grego, Joseph, 1843-1908
- Grego, Jozef
- Grégoire, Charles 1907-
- Gregoire, David P.
- Grégoire, Jean-Claude
- Gregor, Hans-Joachim
- Gregorczyk, Andrzej
- Gregori, Carlo Bartolomeo, 1702-1759
- Gregoric, Diego E Gutiérrez
- Gregoric, Diego Eduardo Gutiérrez
- Gregorič, Matjaž
- Gregorich, L. J.
- Gregorin, Renato
- Gregorini, Armando
- Gregorio, Antonio de.
- Gregório, Bernarda
- Gregório, E. A. (Elisa Aparecida)
- Gregorio, Josefat Gregorio
- Gregorio, Marchese Antonio Di
- Gregorio, Pablo
- Gregorio, Patrícia L. F. (Patrícia Luciane Fernandes)
- Gregorio-Jáuregui Karla M.
- Gregorová, Růžena
- Gregory Farm.
- Gregory N.Stephanopoulos Aristos A.Aristidou Jens Nielsen
- Gregory Nursery Co.
- Gregory Seed Company.
- Gregory, Arofan
- Gregory, Augustus Charles 1819-1905
- Gregory, Beau B.,
- Gregory, Chas. T. 1887-
- Gregory, Constantine
- Gregory, Daniel R.
- Gregory, David
- Gregory, David A.
- Gregory, David P. (David Palache)
- Gregory, Emily L.
- Gregory, Frank H.
- Gregory, Frederick Gugenheim 1893-1961
- Gregory, G. (George), 1754-1808
- Gregory, G. Robinson, 1915-
- Gregory, Herbert E. (Herbert Ernest), 1869-1952
- Gregory, J E
- Gregory, J. E.
- Gregory, J.J.H. & Son.
- Gregory, Jacqueline
- Gregory, James F.
- Gregory, James J. H. (James John Howard), 1827-1910
- Gregory, Jeren
- Gregory, John L.
- Gregory, John Walter 1864-1932
- Gregory, Joseph Tracy, 1914-
- Gregory, Joseph Tracy, 1914-2007
- Gregory, Lee V
- Gregory, Linda A.
- Gregory, Louise H
- Gregory, M. Mathews
- Gregory, Mark
- Gregory, Mark S.
- Gregory, Mary
- Gregory, Michael J.
- Gregory, Neil
- Gregory, Olinthus, 1774-1841
- Gregory, Patrick T.
- Gregory, Phil (Bird watcher)
- Gregory, Philip Herries.
- Gregory, R A
- Gregory, R. A.
- Gregory, R. A. (Robert Aaron)
- Gregory, R. P.
- Gregory, Richard, Sir, 1864-1952
- Gregory, Robert S.
- Gregory, Roger W.
- Gregory, Shari
- Gregory, Steve J
- Gregory, Steven D
- Gregory, Steven M S
- Gregory, Ted
- Gregory, Timothy J
- Gregory, Tremaine
- Gregory, W. B. (William Benjamin), 1871-
- Gregory, William K. (William King), 1876-1970
- Gregory, William, 1803-1858
- Grego-Valencia, Dalia
- Gregson, J D
- Gregson, Jo
- Gregson, John D.
- Gregson, Margaret M.
- Gregson, Robert A M
- Gregurke, John E
- Grehan, Anthony J
- Grehan, John R.
- Gréhant, Nestor, 1838-1910
- Greif, Matthew
- Greif, Roger L
- Greifeneder, Dietmar
- Greig, Edward R
- Greig, John, active 1803-1853
- Greig, Nancy
- Greig, W A
- Greigg's Dahlia Gardens.
- Greig-Smith, Robert
- Greil Bro's Company.
- Greilach, Hugo
- Greiman, Stephen E.,
- Greimler, Josef
- Grein, Michaela
- Greinberg, Reinhold.
- Greiner & Pfeiffer,
- Greiner, Ellis C.
- Greiner, Gary O. G.
- Greiner, Hugo Robert,
- Greiner, J.
- Greiner, Renae D
- Greiner, Tuisco, 1846-1914
- Greismer, J. W.
- Greizerstein, Eduardo
- Greke, Kristine
- Grekul, Chad
- Grekul, Chad William.
- Grela, Iván A.
- Grelen, Harold Eugene, 1929-
- Grell, E. H., 1932-
- Grell, Olaf
- Grelle, Carlos E. V.
- Greller, Andrew M
- Grellet-Tinner, Gerald
- Grémare, Antoine
- Gremillion, Kristen J
- Gremli, A. (August), 1833-1899
- Gremmen, J
- Gremmen, N J M
- Grempel, Renato Grotta
- Gremski, Waldemiro
- Greń, Czesław
- Grenacher, H. (Hermann), 1843-1923
- Grenand, P
- Grenand, Pierre
- Grenard, Fernand, 1866-1942
- Grenas, Wiktor
- Grenda-Kurmanow, Magdalena
- Grende, E
- Grenell, Robert G. (Robert Gordon), 1916-
- Grenell, W. H.
- Grenet, Armand.
- Grenfell, Hugh
- Grenfell, Hugh R
- Grenfell, Margaret
- Grenfell, Wilfred Thomason, Sir, 1865-1940
- Grenha, Viviane
- Grenié, Matthias
- Grenier, Diane
- Grenier, Ève-Lyne
- Grenier, Nickolas P