- Jočys, Martynas
- Jocys, Teresa
- Jodár, Pedro
- Jodice, Patrick G. R.
- Jodidi, S. L. (Samuel Leo), 1867-1944
- Jodin, Henri.
- Jodot, Paul
- Jodrey, Louise H
- Jody Nolin
- Joe Coleman (Firm)
- Joe L. Ullathorne Seed Company.
- Joe Plummer (Firm),
- Joe Shadow Nursery Co.
- Joe Smith (Firm : Seattle, Wash.)
- Joe, Alfred
- Joe, Tony
- Joedicke, Reinhard
- Joel A. Shouse Consulting Services.
- Joel Horner & Son.
- Joel, D. M. (Daniel M.), 1946-
- Joel, Robert V.
- Joele, Flávia R.
- Joels, Luiz Carlos de Miranda
- Joelson, Natalia Zoe
- Joenck, Cristian M
- Joenck, Cristian Marcelo
- Joerg, George J.
- Joerg, W. L. G. (Wolfgang Louis Gottfried), 1885-1952
- Joermann, Gerhard
- Joern, Anthony
- Joffe, A. D.
- Joffe, Boris
- Joffe, Irving B.
- Joffe, Joyce
- Joffé, M Rachel
- Joffily, Ana
- Joffily, J M
- Joffre, A A
- Jofre, Cecilia
- Jofré, Guillermo C.
- Jofre, Jocelyn
- Jofré, Laura E.
- Joger, Ulrich
- Joglekar, Asha
- Joh, Yong-Goe
- Joh. Grüniger.
- Johaadien, Rukaya
- Johan, Ofri
- Johan. Edman.
- Johann Ambrosius Barth (Firm),
- Johann David Zunner.
- Johann Friedrich Gleditschens Buchhandlung,
- Johann, von Koln, active 1471-1491
- Johann, Liana
- Johannes le Mair.
- Johannes, Edward J.
- Johannes, R. E. (Robert Earl), 1936-2002
- Johannesen, E W
- Johannesen, Jes
- Johannessen, Ola M.
- Johannessen, Ståle
- Johannesson, H
- Johannesson, Hanna
- Johannesson-Gross, Kristina
- Johannigman, Joe, Jr.
- Johannsen, Albert, 1871-1962
- Johannsen, O
- Johannsen, O. A. (Oskar Augustus), 1870-1961
- Johannsen, W. (Wilhelm), 1857-1927
- Johannson, Eunice E.
- Johanos, Thea C
- Johansen, C. A. (Carl A.)
- Johansen, Donald A
- Johansen, Frits, 1882-1957
- Johansen, H. William.
- Johansen, Hans, 1897-1973
- Johansen, Jeffrey R
- Johansen, Johan P.
- Johansen, John Atle
- Johansen, Kjell
- Johansen, Marianne Bagge
- Johansen, Roberto M.
- Johansen, Victor.
- Johansen-Winslow Company.
- Johanson, Adolf.
- Johanson, Alfhild E
- Johanson, Donald C
- Johanson, Kjell Arne
- Johanson, Zerina
- Johanssen, O A
- Johanssen, Oskar Augustus, 1870-
- Johansson, Arne Semb
- Johansson, Boas, 1742-1809
- Johansson, Charlotte
- Johansson, Johannes
- Johansson, Ludvig, 1865-1929
- Johansson, Maria
- Johansson, Mats E
- Johansson, Mattias
- Johansson, Michael
- Johansson, Niklas
- Johansson, Veronika
- Johansson, Victor
- Johansson, Warren I.
- Joharchi, Omid
- Johl, H K
- John A. Bruce & Co.
- John A. Cannedy Nursery and Orchards.
- John A. Dockry (Firm)
- John A. Doyle Co.
- John A. Doyle Company.
- John A. Francis (Firm)
- John A. Salzer Seed Co.
- John A. Salzer Seed Co.,
- John A. Sheehan (Firm)
- John A. Stainbrook (Firm)
- John A. Stewart and Son.
- John A. Traxler (Firm)
- John A. Young & Sons.
- John A. Young (Firm)
- John Albrecht Nurseries.
- John Ames (Firm)
- John and Arthur Arch (Firm)
- John and Francis Rivington.
- John B. Beach (Firm)
- John B. Quirk (Firm)
- John B. Varick Company.
- John B. Woods (Firm)
- John Bale, Sons & Danielsson,
- John Bartram & Son (Philadelphia)
- John Bastian (Firm)
- John Baumfalk
- John Bennett & Son.
- John Bernhard (Firm)
- John Bodger & Sons Co.
- John Bodger & Sons.
- John Bohn.
- John Booth Kirkland, 1860-1900
- John Bostwick (Firm)
- John Bowles & Son.
- John Brauer (Firm)
- John Brunning & Sons,
- John Burr (Firm)
- John Burton (Firm)
- John C. Davis (Firm)
- John C. Embry (Firm)
- John C. Eskesen (Firm)
- John C. Teas & Son.
- John C. Williams & Co.
- John Carrigg And Sons,
- John Carter
- John Carter Brown Library.
- John Charlton & Sons (Firm)
- John Charlton & Sons.
- John Childs and Son,
- John Church Company.
- John Ciesla (Firm)
- John Connon Company, Ltd.
- John Crerar Library, Chicago.
- John Crerar Library.
- John D. And Catherine T. Macarthur Foundation.
- John D. Imlay (Firm)
- John Dale & Co.,
- John Davis Plant and Berry Farm (Smithfield, Tex.)
- John Day (Firm)
- John Dick, Jr. (Firm)
- John Dieckmann & Sons,
- John Dirkmaat Company.
- John Doty Engine Co.
- John Douglas.
- John E. Kaufmann
- John E. Nagle (Firm)
- John F. Bruder (Firm)
- John F. Croom & Bro.
- John F. Dayton (Firm)
- John F. Rupp (Firm)
- John F. Shuman & Sons
- John F. Trow & Co.,
- John G. Burrow (Firm)
- John G. Carver and Son.
- John G. Griffith Seed Co.
- John G. Stropkey And Sons Nurseries.
- John G. Zelenka Evergreen Nursery.
- John Gardiner & Co.
- John Geisler (Firm)
- John Gray
- John Gumtz (Firm)
- John H. Allan Seed Co.
- John H. Allan Seed Company.
- John H. Heckner (Firm)
- John H. Krieg (Firm)
- John H. McKibbin (Firm)
- John H. Neeley (Firm)
- John H. Sievers & Co.
- John H. Sievers (Firm)
- John H. Slocombe (Firm)
- John H. Small III, Inc.
- John H. Van Zonneveld Comp.,
- John Harding (Firm : Norwalk, Conn.)
- John Hawkins (Firm)
- John Henderson Co.
- John Holmason & Sons
- John Hume (Firm)
- John Innes Centre.
- John J. Buffington & Co.
- John J. Leghorn & Son.
- John J. Prouty (Firm)
- John L. Bishop (Firm)
- John L. Bunch (Firm),
- John L. Cartwright Nursery.
- John L. Foster & Son.
- John L. Kellogg Seed Company.
- John L. Wilson (Firm)
- John Lawrance (Firm)
- John Leifer (Firm)
- John Lewis Childs (Firm)
- John Lightfoot (Firm)
- John Livingstone Company, Inc.
- John Lockard (Firm)
- John Lovell & Son.
- John M. Eisler Nurseries.
- John M. Houck (Firm)
- John M. Parker & Son Nursery Company
- John M. Parker and Son Nursery Company.
- John M. Root (Firm)
- John M. Root (Firm),
- John M. Stevens (Firm)
- John McGowan (Firm)
- John Meskers Bulb Company.
- John Milne & Sons.
- John Moore (Firm : New York)
- John Mosbell (Firm)
- John Mosbell Company.
- John Mosby Seed Company.
- John Murray (Firm),
- John Murray Expedition 1933-34
- John Murry (Firm)
- John N. Bommersbach (Firm)
- John N. May (Firm)
- John Nourse.
- John Parker & Son Nursery Company
- John Parker & Son Nursery Company.
- John Patzel (Firm)
- John R. & A. Murdoch (Firm)
- John R. & A. Murdoch.
- John R. McDaniel (Firm)
- John R. Risdon Seed Company.
- John R. Satterthwaite (Firm)
- John R. Spelman Co.
- John R. Taft (Firm)